Sinclair C5 /ˌsɪŋkleə siː ˈfaɪv $ -kleər-/ BrE AmE trademark
a type of very small car for one person, invented by Sir Clive ↑ Sinclair in 1985. It had three wheels and used an electric ↑ battery . The C5 never became popular and very few were sold, but people often made jokes about how small and slow it was.