User blog comment:GoDai/GoDai's Translations: T.U.S., Exis, and Phantaminum (Pentaminum)/@comment-98.195.228.74-20120715185055

I think Z stands for Zealot rather than Zergling... Zerglings only use their claws, while Zealots use blades from their hands. Plus, Zealots and Dark Templars are similar.