Sign language

Two men and a woman signing (United States, 2008)
Preservation of the Sign Language, George W. Veditz (1913)

Sign languages (also known as signed languages) are languages that use manual communication to convey meaning. This can include simultaneously employing hand gestures, movement, orientation of the fingers, arms or body, and facial expressions to convey a speaker's ideas. Sign languages often share significant similarities with their respective spoken language, such as American Sign Language (ASL) with American English. Grammar and sentence structure, however, may vary to encourage efficiency and fluidity in speaking.[1][2] It is important to note that just because a spoken language is intelligible transnationally, such as English in the United States and the United Kingdom, does not mean that the sign languages from those regions are as well; ASL and British Sign Language (BSL) were formed independently and are therefore not mutually intelligible.[3]

Linguists consider both spoken and signed communication to be types of natural language, meaning that both emerged through an abstract, protracted aging process and evolved over time without meticulous planning. Sign language should not be confused with "body language", a type of nonverbal communication.

Wherever communities of deaf people exist, sign languages have developed, and are at the cores of local deaf cultures. Although signing is used primarily by the deaf and hard of hearing, it is also used by hearing individuals, such as those unable to physically speak, or those who have trouble with spoken language due to a disability or condition (augmentative and alternative communication).

It is unclear how many sign languages currently exist worldwide. A common misconception is that all sign languages are the same worldwide or that sign language is international. Each country generally has its own, native sign language, and some have more than one (although there are also substantial similarities among all sign languages). The 2013 edition of Ethnologue lists 137 sign languages.[4] Some sign languages have obtained some form of legal recognition, while others have no status at all.

Linguists distinguish natural sign languages from other systems that are precursors to them or derived from them, such as invented manual codes for spoken languages, home sign, "baby sign", and signs learned by non-human primates.


Juan Pablo Bonet, Reducción de las letras y arte para enseñar a hablar a los mudos ("Reduction of letters and art for teaching mute people to speak") (Madrid, 1620)

Groups of deaf people have used sign languages throughout history. One of the earliest written records of a sign language is from the fifth century BC, in Plato's Cratylus, where Socrates says: "If we hadn't a voice or a tongue, and wanted to express things to one another, wouldn't we try to make signs by moving our hands, head, and the rest of our body, just as dumb people do at present?"[5]

Until the 19th century, most of what is known about historical sign languages is limited to the manual alphabets (fingerspelling systems) that were invented to facilitate transfer of words from a spoken language to a sign language, rather than documentation of the language itself. Pedro Ponce de León (1520–1584) is said to have developed the first manual alphabet.[6]

In 1620, Juan Pablo Bonet published Reducción de las letras y arte para enseñar a hablar a los mudos (‘Reduction of letters and art for teaching mute people to speak’) in Madrid.[7] It is considered the first modern treatise of sign language phonetics, setting out a method of oral education for deaf people and a manual alphabet.

Chirogram from Chirologia, 1644

In Britain, manual alphabets were also in use for a number of purposes, such as secret communication,[8] public speaking, or communication by deaf people.[9] In 1648, John Bulwer described "Master Babington", a deaf man proficient in the use of a manual alphabet, "contryved on the joynts of his fingers", whose wife could converse with him easily, even in the dark through the use of tactile signing.[10]

In 1680, George Dalgarno published Didascalocophus, or, The deaf and dumb mans tutor,[11] in which he presented his own method of deaf education, including an "arthrological" alphabet, where letters are indicated by pointing to different joints of the fingers and palm of the left hand. Arthrological systems had been in use by hearing people for some time;[12] some have speculated that they can be traced to early Ogham manual alphabets.[13][14]

The vowels of this alphabet have survived in the contemporary alphabets used in British Sign Language, Auslan and New Zealand Sign Language. The earliest known printed pictures of consonants of the modern two-handed alphabet appeared in 1698 with Digiti Lingua (Latin for Language [or Tongue] of the Finger), a pamphlet by an anonymous author who was himself unable to speak.[15] He suggested that the manual alphabet could also be used by mutes, for silence and secrecy, or purely for entertainment. Nine of its letters can be traced to earlier alphabets, and 17 letters of the modern two-handed alphabet can be found among the two sets of 26 handshapes depicted.

Charles de La Fin published a book in 1692 describing an alphabetic system where pointing to a body part represented the first letter of the part (e.g. Brow=B), and vowels were located on the fingertips as with the other British systems.[16] He described such codes for both English and Latin.

By 1720, the British manual alphabet had found more or less its present form.[17] Descendants of this alphabet have been used by deaf communities (or at least in classrooms) in former British colonies India, Australia, New Zealand, Uganda and South Africa, as well as the republics and provinces of the former Yugoslavia, Grand Cayman Island in the Caribbean, Indonesia, Norway, Germany and the United States.

Frenchman Charles-Michel de l'Épée published his manual alphabet in the 18th century, which has survived basically unchanged in France and North America until the present time. In 1755, Abbé de l'Épée founded the first school for deaf children in Paris; Laurent Clerc was arguably its most famous graduate. Clerc went to the United States with Thomas Hopkins Gallaudet to found the American School for the Deaf in Hartford, Connecticut, in 1817.[18] Gallaudet's son, Edward Miner Gallaudet, founded a school for the deaf in 1857 in Washington, D.C., which in 1864 became the National Deaf-Mute College. Now called Gallaudet University, it is still the only liberal arts university for deaf people in the world.

Sign languages generally do not have any linguistic relation to the spoken languages of the lands in which they arise. The correlation between sign and spoken languages is complex and varies depending on the country more than the spoken language. For example, the US, Canada, UK, Australia and New Zealand all have English as their dominant language, but American Sign Language (ASL), used in the US and English-speaking Canada, is derived from French Sign Language whereas the other three countries sign dialects of British, Australian and New Zealand Sign Language.[19] Similarly, the sign languages of Spain and Mexico are very different, despite Spanish being the national language in each country,[20] and the sign language used in Bolivia is based on ASL rather than any sign language that is used in a Spanish-speaking country.[21] Variations also arise within a 'national' sign language which don't necessarily correspond to dialect differences in the national spoken language; rather, they can usually be correlated to the geographic location of residential schools for the deaf.[22][23]

International Sign, formerly known as Gestuno, is used mainly at international deaf events such as the Deaflympics and meetings of the World Federation of the Deaf. While recent studies claim that International Sign is a kind of a pidgin, they conclude that it is more complex than a typical pidgin and indeed is more like a full sign language.[24]

Other Languages
Afrikaans: Gebaretaal
العربية: لغة إشارة
Bahasa Banjar: Utau
Bân-lâm-gú: Chhiú-gí
беларуская: Мова жэстаў
беларуская (тарашкевіца)‎: Мова жэстаў
Bikol Central: Palba
བོད་ཡིག: བརྡ སྐད
čeština: Znakový jazyk
Cymraeg: Iaith arwyddo
dansk: Tegnsprog
ཇོང་ཁ: བརྡ་སྐད་
eesti: Viipekeel
emiliàn e rumagnòl: Léngua di ségn
Esperanto: Signolingvo
føroyskt: Teknmál
客家語/Hak-kâ-ngî: Sú-ngî
한국어: 수화
hrvatski: Znakovni jezici
বিষ্ণুপ্রিয়া মণিপুরী: প্রতীক ভাষা
Bahasa Indonesia: Bahasa isyarat
interlingua: Lingua de signos
íslenska: Táknmál
Kiswahili: Lugha ya ishara
latviešu: Zīmju valoda
lietuvių: Gestų kalba
magyar: Jelnyelv
Bahasa Melayu: Bahasa isyarat
Nederlands: Gebarentaal
日本語: 手話
norsk: Tegnspråk
norsk nynorsk: Teiknspråk
oʻzbekcha/ўзбекча: Imo-ishora tili
ਪੰਜਾਬੀ: ਸੈਨਤ ਭਾਸ਼ਾ
Piemontèis: Lenghe dij segn
português: Língua de sinais
rumantsch: Lingua da segns
русиньскый: Жестовый язык
sicilianu: Lingua dî signa
Simple English: Sign language
slovenčina: Posunková reč
slovenščina: Znakovni jezik
Soomaaliga: Fara-ka hadal
српски / srpski: Знаковни језик
srpskohrvatski / српскохрватски: Znakovni jezik
svenska: Teckenspråk
తెలుగు: సంకేత భాష
Türkçe: İşaret dili
українська: Жестова мова
Tiếng Việt: Ngôn ngữ ký hiệu
ייִדיש: שטום לשון
粵語: 手語
中文: 手語