mouse
n.β Β«Meanwhile, the Stinebakers make no attempt to conceal the fact that the Thunderbirdβat least to some devout worshippers of domestic vehiclesβis sort of a sacrilegious Frankenstein machine. Inside the Ford body sits a Chevrolet small-block engine. The motor is known to enthusiasts as a “mouse”βbig-blocks are known as “rats”βso a small rubber mouse serves as the carβs mascot. The Stinebakers also adorn the dashboard with a sign reading “Built Ford tough with Chevy stuff.”Β» ββKickingβ It” by Daniel Pike State Journal-Register (Springfield, Illinois) Sept. 24, 2006. (source: Double-Tongued Dictionary)