[1] : Jargon File (4.3.1, 29 Jun 2001)

pico- pref. si: a quantifier meaning  10^-12 smaller than nano-;
   used in the same rather loose connotative way as nano- and micro-.
   this usage is not yet common in the way nano- and micro- are, but
   should be instantly recognizable to any hacker. see also
   quantifiers, micro-.


see also:
nano- micro- quantifiers 

[2] : The Free On-line Dictionary of Computing (27 SEP 03)

pico-
     
        prefix
     
     
see also:
prefix 

Pico- >> P Words
Pico-, definition of term: Pico-
pico-_pag1.html