ATG

"ATG" is an acronym that stands for "against the grain." It refers to a shaving pass in which one shaves in a direction opposite that in which the hair grows. For example, if the hair grows "north-to-south," then an ATG pass will shave "south-to-north." An ATG pass can be compared with a pass that is WTG ("with the grain" or direction of hair growth) or XTG ("across the grain" or direction of hair growth).

Different kinds of passes are commonly combined into a single shave (see The Multiple Pass Shaving Technique).

Another commonly-used three-character acronym is BBS ("baby's bottom smooth").