Semaphore

Domain	Definitions
Computing	Semaphore The classic method for restricting access to shared resources (e.g. storage) in a multi-processing environment. They were invented by Dijkstra and first used in T.H.E operating system. A semaphore is a protected variable (or abstract data type) which can only be accessed using the following operations: P(s) Semaphore s; 0 / s = s-1;">while (s == 0) ; / wait until s>0 / s = s-1; V(s) Semaphore s; s = s+1; Init(s, v) Semaphore s; Int v; s = v; P and V stand for Dutch "Proberen", to test, and "Verhogen", to increment. The value of a semaphore* is the number of units of the resource which are free (if there is only one resource a "binary semaphore" with values 0 or 1 is used). The P operation busy-waits (or maybe sleeps) until a resource is available whereupon it immediately claims one. V is the inverse, it simply makes a resource available again after the process has finished using it. Init is only used to initialise the semaphore before any requests are made. The P and V operations must be indivisible, i.e. no other process can access the semaphore during the their execution. To avoid busy-waiting, a semaphore may have an associated queue of processes (usually a FIFO). If a process does a P on a semaphore which is zero the process is added to the semaphore's queue. When another process increments the semaphore by doing a V and there are tasks on the queue, one is taken off and resumed. (1995-02-01). Source: The Free On-line Dictionary of Computing.
Post & Telecom	A wayside signal device by which indications are given by the position of a movable arm in daylight hours and by the colour of a light in darkness. Source: European Union. (references)
Public Administration	System or apparatus for sending signals through a code of oscillating arms, lanterns or flags; In Italian it designates traffic lights. Source: European Union. (references)
Source: compiled by the editor from various references; see credits.

Specialty Definition: Semaphore

Synonyms within Context: Semaphore

Commercial Usage: Semaphore

Domain	Title
Books	Brown's Vick Semaphore Cards (reference) Semaphore (reference) Semi Madness: Voices from Semaphore (reference) Telecommunications: Two Centuries of Progress from Semaphore to Multimedia: A History of Worldwide Telecommunications (reference) The Alexandria Semaphore (reference) (more book examples)

Periodicals	Semaphore (reference) (more periodical examples) (more classical music examples; more popular music examples)
Source: compiled by the editor from various references; see credits.

Image Slideshow: Semaphore

Photo Album: Semaphore

Thumbnail	Description & Credit	Thumbnail	Description & Credit
	Contract wiredrag launch TWILIGHT First view without wiredrag gear - second with wiredrag gear installed Semaphore signalling device installed on second picture.Credit: Coast & Geodetic Survey Historical Image Collection.		Setting out the drag and buoys from the guide launch Note semaphore signaling device on stern Wiredrag party of J. H. Hawley.Credit: Coast & Geodetic Survey Historical Image Collection.
	Moored in port, June 1901. Note the large National Ensign, booms rigged out as propeller guards, and semaphore "paddles" on the mainmast.Credit: NAVY.		At anchor, 2 May 1907. Note the semaphore "paddles" mounted on her foremast. These were fitted to her mainmast in 1901.Credit: NAVY.
	Signalmen posing with a lighted semaphore device on board the battleship, circa 1909.Credit: NAVY.		Underway in about 1920. Note semaphore signalman atop her second turret.Credit: NAVY.
	Photographed prior to her World War I Naval service, with a man on her foredeck communicating via semaphore flags. She is flying the U.S. Yacht Ensign at her stern. The Navy placed this boat in commission on 28 April 1917 as USS Mist (SP-567) and formally acquired her on 12 May 1917. She was returned to her owner on 3 February 1919.Credit: NAVY.		Semaphore, Grand Island, Nebraska.Credit: Library of Congress.
	Semaphore, street police. Stop/Go street sign.Credit: Library of Congress.
Source: compiled by the editor from various references; see credits.

Usage Frequency: Semaphore

Expression: Semaphore

Frequency of Internet Keywords: Semaphore

Modern Translations: Semaphore

Language		Translations for "semaphore"; alternative meanings/domain in parentheses.
Albanian		semafor (beacon, traffic light), jap sinjal (signal). (various references)

Arabic		‏الملوحة جهاز, ‏الإعلام الإشاري. (various references)

Bulgarian		семафор (signal), сигнализирам със семафор. (various references)

Chinese		动臂信号机. (various references)

Czech		signalizovat pažemi, signalizace pažemi, semafor (traffic light). (various references)

Danish		semafor, armsignal. (various references)

Dutch		semafoor, vlaggespaak. (various references)

Finnish		siipiopastin, semafori, opastin (signal). (various references)

French		sémaphore. (various references)

German		Zeichenträger, Semaphor. (various references)

Greek		σημαφόρος, σηματογράφοσ, σηματοφόροσ, σηματοφόρος,σημαφόρος, σηματοδότης του ψαλιδιού της σιδηρογραμμής, οπτικόσ τηλεγράφοσ. (various references)

Hungarian		szemafor (gantry, semaphoric, signal, signal gantry). (various references)

Italian		semaforo (light signal, lights, traffic light, traffic lights). (various references)

Japanese Kanji		手旗信号 (flag signaling), セックス�"�業 (cement, manufacturer of assembled products, savory, semantic, semantics, semicolon, semiconductor, semi-double bed, seminar, semiprofessional, semi-tight skirt, sepia, session, set, set position, setting, setting lotion, setup, seven, Seven-Eleven, sex industry, shoulder length hair, three-quarter bed), 信号機 (signal), 信号 (signal, traffic lights). (various references)

Japanese Katakana		し�"�"うき (signal, signal flag), し�"�"う (signal, traffic lights), セマフォア , セマフォ , てばたし�"�"う (flag signaling). (various references)

Korean		시그널. (various references)

Manx		semaphore. (various references)

Pig Latin		emaphoresay

Portuguese		semáforo (traffic light, traffic lights). (various references)

Romanian		semafor (light, street light, Telegraph). (various references)

Russian		семафор, сигнализировать (annunciate, flagged, semaphoring, signal, signaled, signalize, signalled). (various references)

Serbo-Croatian		semafor (scoreboard, signal, traffic light), javiti semaforom. (various references)

Spanish		semáforo (filter, light, lighting, lights, traffic light). (various references)

Swedish		semafor (indicator). (various references)

Turkish		semafor ile işaretleşmek, semafor, işaret verme aleti, bayraklarla işaret verme. (various references)

Ukranian		семафор, сигналізувати за допомогою семафора. (various references)
Source: compiled by the editor from various translation references.

Ancestral Language Translations: Semaphore

Derivations & Misspellings: Semaphore

Anagrams: Semaphore

Scrabble® Enable2K-Verified Anagrams
	Words within the letters "a-e-e-h-m-o-p-r-s"
	-2 letters: amperes, hampers, hareems, reshape.
	-3 letters: ahorse, ameers, ampere, ashore, ephors, haeres, hamper, hareem, harems, hearse, hermae, heroes, herpes, hoarse, homers, hopers, mahoes, masher, mopers, morphs, mosher, operas, pareos, pharos, phrase, posher, proems, ramees, ramose, raphes, rehems, remaps, repose, reshoe, seamer, sempre, serape, seraph, shaper, sherpa, shmear, soaper, spahee, sphere.
	-4 letters: ameer, apers, apres.
	Words containing the letters "a-e-e-h-m-o-p-r-s"
	+1 letter: atmosphere, semaphored, semaphores.
	+2 letters: atmosphered, atmospheres, metanephros.
	+3 letters: demographers, demographies, gametophores, melanophores, metamorphose, overemphases, overemphasis, phrasemonger.
	+4 letters: dermatophytes, hymenopterans, magnetosphere, metamorphosed, metamorphoses, overemphasize, phrasemongers, seismographer, spermatophore, spermatophyte.
	+5 letters: aromatherapies, cephalometries, chemotherapies, chemotherapist, encephalograms, hermaphrodites, hypermetropias, magnetospheres, magnetospheric, microcephalies, overemphasized, overemphasizes, paedomorphoses, petrochemicals, pneumatophores, pneumothoraces, pneumothoraxes, rapprochements, seismographers, seismographies, spermatophores, spermatophytes, superphenomena, thermographies.
Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro.

Alternative Orthography: Semaphore

Hexadecimal (or equivalents, 770AD-1900s) (references)

53 65 6D 61 70 68 6F 72 65

Leonardo da Vinci (1452-1519; backwards) (references)

American Sign Language (origins from 1620-1817 in Italy and, especially, France) (references)

⁼

Semaphore (1791, in France) (references)

Braille (1829, in France) (references)

Morse Code (1836) (references)

... . -- .- .--. .... --- .-. .

Dancing Men (Sir Arthur Conan Doyle, 1903) (references)

Binary Code (1918-1938, probably earlier) (references)

01010011 01100101 01101101 01100001 01110000 01101000 01101111 01110010 01100101

HTML Code (1990) (references)

&#83 &#101 &#109 &#97 &#112 &#104 &#111 &#114 &#101

ISO 10646 (1991-1993) (references)

0053 0065 006D 0061 0070 0068 006F 0072 0065

British Sign Language (Fingerspelling, BSL; 1992, British Deaf Association Dictionary of British Sign Language) (references)

Encryption (beginner's substitution cypher): (references)

Context	Synonyms within Context (source: adapted from Roget's Thesaurus).
Indication	Signal, signal post; rocket, blue light; watch fire, watch tower; telegraph, semaphore, flagstaff; cresset, fiery cross; calumet; heliograph; guidon; headlight.
Source: adapted from Roget's Thesaurus.

Parts of Speech	Percent	Usage per 100 Million Words	Rank in English
Noun (singular)	88.24%	45	50,900
Lexical Verb (infinitive)	7.84%	4	175,879
Lexical Verb (base form)	1.96%	1	339,140
Noun (proper)	1.96%	1	339,140
Total	100.00%	51	N/A

Expression	Frequency per Day	Expression	Frequency per Day
semaphore	114	american flyer man sam semaphore	3
expired has period semaphore time	12	unix semaphore	3
semaphore flag	9	semaphore signalling	3
semaphore time	5	121 net semaphore use	2
semaphore signal	5	another cannot create semaphore system	2
semaphore train	5	definition semaphore	2
partner semaphore	4	deltek semaphore	2
period semaphore time	4	history semaphore	2
mutex semaphore	3	code semaphore	2
alphabet semaphore	3	semaphore trafficator	2
java semaphore	3	deltek semaphore training	2
Source: compiled by the editor from various references; see credits.

Language	Period	Translations
Greek	700 BCE-300 CE	sema. (various references)
Source: compiled by the editor from various references.

Derivations
	Words beginning with "semaphore": semaphored, semaphores. (additional references)
Misspellings
	"Semaphore" is suggested in spellcheckers for the following: semafore, semaphone, semaphor, semephore, semiphore, Sempacher, Serampore, smaphore. (additional references)
Source: compiled by the editor, based on several corpora (additional references).

Expression using "semaphore": semaphore plant. Additional references.
Source: compiled by the editor from various references; see credits.

Semaphore

Definitions: Semaphore

Semaphore

Noun

Verb

Specialty Definitions: Semaphore

Specialty Definition: Semaphore

Synonyms within Context: Semaphore

Indication

Crosswords: Semaphore

Commercial Usage: Semaphore

Books

Periodicals

Image Slideshow: Semaphore

Illustrations:Semaphore

Computer Images:Semaphore

Photo Album: Semaphore

Usage Frequency: Semaphore

Expression: Semaphore

Frequency of Internet Keywords: Semaphore

Modern Translations: Semaphore

Albanian

Arabic

Bulgarian

Chinese

Czech

Danish

Dutch

Finnish

French

German

Greek

Hungarian

Italian

Japanese Kanji

Japanese Katakana

Korean

Manx

Pig Latin

Portuguese

Romanian

Russian

Serbo-Croatian

Spanish

Swedish

Turkish

Ukranian

Ancestral Language Translations: Semaphore

Derivations & Misspellings: Semaphore

Derivations

Misspellings

Anagrams: Semaphore

Scrabble® Enable2K-Verified Anagrams

Alternative Orthography: Semaphore

53 65 6D 61 70 68 6F 72 65

... . -- .- .--. .... --- .-. .

01010011 01100101 01101101 01100001 01110000 01101000 01101111 01110010 01100101

&#83 &#101 &#109 &#97 &#112 &#104 &#111 &#114 &#101

0053 0065 006D 0061 0070 0068 006F 0072 0065

537179678274818471

INDEX

Illustrations:
Semaphore

Computer Images:
Semaphore