The third computer that Apple built was either the Apple II Pus
or, if you group all the Apple II variations together as a single
model, the Apple III.
The sequence up to the Apple III was:
▪ Apple I
▪ Apple II
▪ Apple II Plus
▪ Apple IIe
▪ Apple IIc
▪ Apple IIGS
▪ Apple IIc Plus
▪ Apple III