Pibook

In Digimon Adventure, the pibook is Koushiro Izumi's laptop that he takes with him everywhere and relies on to the point that it is suggested a few times in the series that he likes his computer more than his friends. The other members of his group seem to share a bit of a love-hate relationship with it, very happy when it helps them out of a bad situation, but very annoyed when Koushiro seems to go into his own little world with it. It's a very high-tech laptop that always seems to have enough power and a fast enough modem to hack into various computer systems and even the very code of the Digital World. It even comes with a headset that Koushiro uses at one point to establish contact with Mimi Tachikawa when she gets lost in some ancient ruins (ironically in a fit over Koushiro ignoring her in favor of trying to use his pibook to crack a mysterious computer code that reappears on the walls of various landmark buildings) It is to be assumed that the term "pibook" is a pun referring to the Apple iBook.