dactylology

詳細解釋：

dac.ty.lol.o.gy

n.（名詞）
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.
手語：用手指和手來交流和表達思想，如聽說有障礙的人所用的手勢語字母表