“Face brick” is a term for bricks that are made to be more impervious to water, and are intended to be exposed as a finish. Opposed to those are “common brick”, which absorb water quite readily and are intended only for inner wythes of a wall, where they will not be exposed.
“Brick veneer” refers to bricks which are only a finish, and are not structural, as opposed to a solid brick wall or a brick and block wall which carries loads.
Then we have “thin brick”, which is a veneer that is applied to a wall much like tile, and gives the appearance of brick without the weight or the thickness.
To answer the original question, the brick veneer may have been built with a small space between its back and the wall sheathing, and is anchored to the wall, usually by galvanized sheet metal ties which are intended to allow movement . I don’t think there is any code requirement relating to the issue, and there probably isn’t any generally accepted standard which refers to it.
The sheet metal ties, if they exist, should allow the brick veneer to move inwards slightly, and move outwards more slightly. The question should be, if the brick veneer moves at all, does it show any evidence of a crack anywhere? Do all the bricks from the brick shelf on up move together, or do only the top few courses move? Or is the movement so small that you can’t tell?
Another possible issue is that if you can see the edge of the brick veneer, the joint between it and the sheathing should be properly caulked or sealed, with a non-hardening sealant which will tolerate small movements.