The Collaborative International Dictionary of English v.0.48:

Nickle \Nic"kle\, n. (Zool.)
   The European woodpecker, or yaffle; -- called also nicker
   pecker.
   [1913 Webster]

The Jargon File (version 4.4.7, 29 Dec 2003):

nickle
 /ni'kl/, n.

    [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.


The Free On-line Dictionary of Computing (30 December 2018):

nickle

   /ni'kl/ ["nickel", common name for the US 5-cent coin] A
   nibble + 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.