The term 'apple piece' can be broken down into three separate words: CORE (4 letters), IMAC (4 letters), and ITUNE (5 letters). CORE is an acronym for the Common Open Research Emulator, a computer system developed by Apple Inc. to simulate the behavior of a computer system. IMAC stands for the iMac, a line of all-in-one Macintosh desktop computers designed and built by Apple Inc. ITUNE is a media player, media library, online radio broadcaster, and mobile device management application developed by Apple Inc.