manual alphabet

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An alphabet used for communication by hearing-impaired people in which finger positions represent the letters.

from the GNU version of the Collaborative International Dictionary of English.

• noun An alphabet of signs made by movement of the hands, used by the deaf; in it letters are represented by finger positions. See dactylology.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun dactology An alphabet whose letters are represented by positions of the hand and fingers.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an alphabet used by the deaf; letters are represented by finger positions