Apple Without A Bite, the
This symbol first turns up in HW] with the arrival of the Callahan family's new Apple IIIc+1 computer. The Apple logo in question is the early striped version, without the "bite". To Dairine, at first more interested in the computer itself than any weirdness in its logo, this difference is initially of no interest. But when she clones the computer and takes off on her Ordeal, she slowly begins to catch on to what the apple's biteless status implies.
The next mention of the symbol comes in TWD, when Dairine upgrades the Callahans' household computer. That machine arrived with the software version of the ''Wizard's Manual'' installed. Because of this, Dairine has become involved with the Manual software's beta group, and the upgraded computer on which she's testing the beta version is plainly a cognate of the Power Macintosh G4 Cube]. Its logo is the modern, non-striped variety, and biteless.
The latest variation on this theme occurs in WAW, when a wizard turns up at the crisis meeting on the Moon carrying a WizPod that features a "glass" version of the biteless logo.
1 This computer is, of course, fictional, and loosely based on the [www.apple-history.com/gallery/aIIc Apple IIc/IIc+.]