The #2a, #2b, et cetera are extraneous, if you don't know what the cogs mean those little hashes and numbers and letters aren't going to mean much to you anyways, they're not even legible on the smallest cog. What they instead accomplish is take up room on those tiny cog wheels so that not everyone's logos can fit. It'd be more space-efficient to just put the number in the middle of the cog and drop the hashes and letters.