The American Manual Alphabet is a manual alphabet that augments the vocabulary of American Sign Language when spelling individual letters of a word is the preferred or only option, such as with proper names or the titles of works. Letters should be signed with the dominant hand and in most cases, with palm facing the viewer.

美國手語字母是一套增補美國手語用的手語字母，為拼寫人名、地名、著作等專有名詞時使用，某些詞語也會使用手語字母來表達。大多數情形下，常用的手會被用來拼字，掌心面對著觀察者。

不要用在考试作弊哦

wiki的资料

English: http://en.wikipedia.org/wiki/American_Sign_Language_alphabet

Chinese: http://zh.wikipedia.org/wiki/%E7%BE%8E%E5%9C%8B%E6%89%8B%E8%AA%9E%E5%AD%97%E6%AF%8D