A mechanical sentinel in attack mode
A mechanized sentinel or mechanical was a semi-autonomous machine that was used to guard some important person or property.
In 2269, Tchar guarded the Soul of the Skorr with mechanized sentinels. (TAS: "The Jihad")
The mechanized sentinel, Swooper, and the Maravel dragon-like creature all used slightly modified versions of the same set of animations.
They were described in the script as "immense, metallic flying creatures."