Pentium
Pentium: n. The name given to Intel's P5 chip, the successor to
the 80486. The name was chosen because of difficulties Intel had in
trademarking a number. It suggests the number five (implying 586)
while (according to Intel) conveying a meaning of strength "like
titanium". Among hackers, the plural is frequently `pentia'. See
also Pentagram Pro.
Intel did not stick to this convention when naming its P6 processor
the Pentium Pro; many believe this is due to difficulties in
selling a chip with "sex" in its name. Successor chips have been
called `Pentium II' and `Pentium III'.