chicken head
The {Commodore} Business Machines logo, which strongly
resembles a poultry part. Rendered in ASCII as "C◦". With
the arguable exception of the {Amiga}, Commodore's computers
are notoriously crocky little {bitty box}es (see also
{PETSCII}). Thus, this usage may owe something to Philip
K. Dick's novel "Do Androids Dream of Electric Sheep?" (the
basis for the movie "Blade Runner"; the novel is now sold
under that title), in which a "chickenhead" is a mutant with
below-average intelligence.
[{Jargon File}]