All Terrain Soup
All-Terrain-Walkers.
Star Wars's Imperial Military and the Grand Army it usurped really liked their acronyms (much like their real world counterparts). The most egeriogus examples being the assorted combat walkers, which all start with AT, an acronym for "All Terrain", which is supposedly one of the justifications for the legs in the first place.
AT-RT
AT-RTs On the table top
AT-PT
The oft forgotten little cousin to the AT-ST, For the most part the role it once had in the story has been replaced with the AT-RT. Almost exactly an (armored)Sentinel clone.
AT-DP
AT-ST
"All Terrain-Scout Transport", aka "The Chicken Walker", aka "the thing that the Imperial Guard Sentinel is a shameless rip-off for". Basically a box-shaped control room built around a central heavy laser gun and mounted on two spindly legs.
The AT-ST on the Table-Top
Content
Content.
AT-AT
"All Terrain-Armored Transport". These are the big, BIG bastards amongst the All-Terrain Walkers; enormous quadrupedal armored transports who look almost like giant robot cows, but who aren't so funny when you realize they can shrug off heavy artillery like it was nothing. Slow as molasses, but they will get to where they're going, and the head-like cockpit's twin heavy lasers can dish out a fair bit of pain along the way.