I've heard fans pronounce the acronym for Imperial Walkers by saying each letter (A-T-A-T) and also by saying the two parts as words (At-At). Is there any consensus on which is right?
AT-AT stands for All Terrain Armored Transport, but they're only referred to as Imperial Walkers in Empire Strikes Back.
Was the name introduced through the action figures, and people just interpreted the pronunciation differently? How does George Lucas refer to them?
How are they referred to in canon materials now that they're showing up in Rebels? Is there a canon explanation of why people would pronounce it differently?
UPDATE: There's a lot of great stuff going on in the comments regarding the pronunciation in video games of varying canonicity, which makes it seem like both pronunciations have been in use in new Disney continuity. Can anyone verify this? Is there an in-universe explanation of why there might be two? Is it rebel v imperial jargon?