Dactylology

noun

1. The use of the fingers and hands to communicate and convey ideas, as in the manual alphabet used by hearing-impaired and speech-impaired people.
2. The art of communicating ideas or conversing by the fingers; the language of the deaf and dumb. See deafmute.
3. The art of communicating ideas by certain movements and positions of the fingers; -- a method of conversing practiced by the deaf and dumb.
4. The use of the fingers and hands to communicate ideas, especially by the deaf.