Sign language is a sign language for hearing-impaired people (deaf-mute, hereinafter referred to as hearing-impaired people) to communicate and exchange ideas with each other. It is an important auxiliary tool for spoken language and the main communication tool for hearing-impaired people. The difference between sign language and language mainly lies in pronunciation and whether the deaf think with gestures. Linguists believe that sign language is a symbol, not a language, according to the phonetic properties of language; Deaf educators, special educators and hearing-impaired people think that sign language is also a language, a branch of language and a special language form according to its language attributes. However, sign language can't absolutely correspond to written language, and the written language of hearing-impaired people is limited by sign language, so it can't form a correct written language. Although sign language cannot be used as a complete language, its linguistic attributes indicate that sign language should be used as one of the language types.

There are two kinds of sign language in essence: typing (natural gesture) and typing (grammatical gesture), while the basic words of the unified sign language album are mainly typing "meaning" and supplemented by typing "character". If classified, it can be roughly divided into the following categories:

0 1, refers to the thing itself is sign language:

Example: head, nose, ears and mouth. ....

02. Sign language to describe or explain shapes:

For example: bananas, oranges and grapefruit. ....

03. Sign language for action:

Example: run, come, go, wash and read. ....

04. Sign language that refers to something or a part of something:

Examples: ducks, birds, houses, cows, dogs and sheep. ....

05, refers to the sign language related to the thing itself:

Example: thinking, remembering, being smart. ....

06, written sign language:

For example: person, worker, owner, king, date and month. ....

07. Imitation or symbolic sign language:

Example: writing, bed, cold and heat. ....

08, direction sign language:

Example: Tell you, love you, ask him. ....

09. Sign language of antonyms in the opposite direction:

Example: progress, retrogression, knowing, not knowing, yes and no. ....

10. English sign language:

Example: WC (toilet), doctor, master. ....

1 1. Name sign language.

12. If you can't sign language, you can write your fingers directly with your index finger:

Example: "Fragments" of a coin ....

Some sign languages can't express a word with one gesture, and sometimes a gesture can express a sentence. For example, I don't know, but on the contrary, there is a word that can only be expressed clearly with two or three gestures. For example, some words can't be typed in the same sign language, and even some words can only be explained by the existing limited sign language, or by finger sign language, which is usually more specific and easier to express; It is difficult to abstract adjectives, which is also the resistance phenomenon of sign language in various countries.