Wikipedia
A is a fictional artificial intelligence, walker/roller in the Ghost in the Shell universe; appearing in the manga, created by Masamune Shirow, and the Stand Alone Complex sub-universe. Nine of them are assigned to Section 9's use originally. They are spider-like, multi-legged combat vehicles, equipped with artificial intelligence. The spider design appears in other places in Shirow's work, like the Appleseed manga. Shirow is noted to keep numerous spiders as pets.
Production I.G was unable to use the Fuchikoma design in the 2002 Stand Alone Complex anime TV series due to copyright conflicts. However, Masamune Shirow was able to design a legally safe equivalent to the spider-tanks for the new show, which he named the "Tachikoma". There are distinct differences in the design, most significantly in the 'eyes' and the vertically oriented abdomen. Still, the tanks are easily recognizable as descendants of the original Fuchikoma. Their AI 'personalities' and roles in the new series are indistinguishable from their predecessors in the manga.