What does ZAKU stand for? 

Zaku

The Zaku (ザク, Zaku) is a fictional line of manned robots (mecha) from Mobile Suit Gundam, part of the Universal Century fictional universe, where they are the Principality of Zeon's most commonly fielded Mobile Suits. The most widely known model is the MS-06 Zaku II series. It is redesigned by Kunio Okawara based upon the earlier draft by the series director Yoshiyuki Tomino, in which only the name was kept. The Zaku II has seen various redesigns and variants for hundreds of pieces of merchandise, and the Japanese post office has two stamps with Zaku IIs on them. The Zaku's aesthetic can be seen in more symbolic homages in the Gundam mythos, such as the GINN and ZAKU Warrior from Mobile Suit Gundam SEED, the Busshi from Mobile Fighter G Gundam, and the Jenice from After War Gundam X. After the original show's run, Okawara and other designers created a number of variants of the Zaku. Many of these modified configurations never appeared in animation, but they are official Mobile Suit variations, appearing instead in plastic model form and in various Gundam video games. The MS-06 Zaku II is still a major force in Gundam, with almost every new side story in the Universal Century adding a new variant to the basic frame.

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