↑Think tank is a slang term used to describe a robotic weapons platform that makes use of artificial intelligence to enhance its abilities. Most of the think tanks portrayed in ↑Ghost in the Shell (manga, films, and series), along with other machinery, (e.g. attack helicopters such as the Jigabachi AV) are developed and manufactured by a fictional company named Kenbishi Industries.
The above is ↑Cole Blaq‘s rendition of such a machine. In the foreground is a custom ↵lego friends minidoll by ↑Mike the Maker depicting the cyborg Major ↑Motoko Kusanagi. Here are two more lego renditions: ↑by gambort, and ↑by obscurance.