Definitions for nickle
the European woodpecker, or yaffle; -- called also nicker pecker
The New Hacker's Dictionary
[from ‘nickel’, common name for the U.S. 5-cent coin] A nybble + 1; 5 bits. Reported among developers for Mattel's GI 1600 (the Intellivision games processor), a chip with 16-bit-wide RAM but 10-bit-wide ROM. See also deckle, and nybble for names of other bit units.