What does AT-AT stand for?

The story behind the answer

Imperial walkers are named by function: the first “AT” designates All Terrain capability, while the second points to a heavily protected transport role. That rules out “Armored Tactical Assault Transport” (it drops the “All Terrain”), “All Terrain Assault Transport” (assault units spearhead attacks rather than primarily carry troops and equipment), and “All Terrain Artillery Transport” (artillery implies long-range bombardment; AT-ATs engage directly and ferry forces).

Debuting in The Empire Strikes Back’s Battle of Hoth and built by Kuat Drive Yards in canon, these towering quadrupeds were engineered for intimidation and endurance across harsh environments. Their naming mirrors other Imperial designs like the AT-ST (Scout Transport), underscoring a standardized “All Terrain” designation across walker variants.