Sign Language

Complete natural languages, expressed visually.

Sign languages are full natural languages with their own vocabulary, grammar and regional variation. They are not signed versions of spoken languages, and they are not invented codes — they arise naturally wherever deaf communities form.

They are not universal

There are well over 300 sign languages. American Sign Language and British Sign Language are mutually unintelligible despite both countries speaking English — ASL descends partly from French Sign Language, so it is closer to LSF than to BSL. The assumption of a single universal sign language is the most common misconception about them.

Grammar is spatial

Signs are built from handshape, location, movement, palm orientation and non-manual markers — facial expression and head position, which are grammar rather than emotion. Raised eyebrows can mark a yes-no question; a furrowed brow a wh-question. Signing space is used referentially: a person can be placed at a point and later referred to by indicating it.

Word order differs from the surrounding spoken language. ASL commonly uses topic-comment structure rather than English subject-verb-object, and many verbs inflect directionally to show subject and object in the movement itself.

Fingerspelling is a small part

The manual alphabet spells out proper nouns and words with no established sign. It is not the language — a fluent conversation uses relatively little of it, and learning the alphabet is not learning to sign.