ZT meaning in Medical ?

Zoo Tycoon is a series of business simulation video games. The worlds focus around building and running successful zoo scenarios. The series was initially developed by Blue Fang Games and published by Microsoft Studios who later in 2001-2008 went on to create two stand-alone video games and seven expansion packs for PC and Macintosh platforms. In 2013, Microsoft Studios released a new Zoo Tycoon game, developed by Frontier Developments for Xbox One and Xbox 360. An enhanced version of the Xbox game, Zoo Tycoon: Ultimate Animal Collection, was released for Windows 10 and the Xbox One on October 31, 2017.

The series is considered finished. Frontier Developments, who developed the last Zoo Tycoon in 2013, created the spiritual successor to the series, named Planet Zoo, in 2019.