fingerspelling

Fingerspelling (sometimes known as dactylology) is the representation of the letters of a writing system, and sometimes numeral systems, using only the hands. There are many manual alphabets (also known as finger alphabets or hand alphabets) in use, past and present — especially in deaf education and, subsequently adopted as a distinct part of a number of sign languages around the world.
See more at Wikipedia.org...

Fingerspelling, n the manipulation of fingers into different positions, usually based on the manual alphabet, to represent letters of the alphabet. [more]Fingerspelling - Community and Resources

Noun
1. an alphabet of manual signs
(synonym) finger spelling
(hypernym) sign language, signing
(derivation) fingerspell, finger-spell

Verb
1. communicate by means of specific gestures, as an alternative to Sign Language; "The Deaf often fingerspell"
(synonym) finger-spell
(hypernym) communicate, intercommunicate
(derivation) finger spelling, fingerspelling