The term 'APPLE ON A DESK' can be broken down into three crossword solutions: MAC (3 letters), INBOX (5 letters), and IMAC (4 letters). MAC stands for Media Access Control, which is a unique identifier assigned to a device connected to a network. INBOX is a term used to refer to an email inbox, which is a folder that stores incoming emails. IMAC is an acronym for 'iMac, ' which is a brand of all-in-one desktop computers designed and sold by Apple Inc.