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I don't think that there is an official list anywhere. Here are some of the more common ones.

DP -- Dense Pheomelanin -- a nontestable gene that intensifies red pigment and makes liver chestnuts

KP -- Kit Promoter -- a nontestable gene -- must be homozygous and in the presence of two Kit mutations to show -- produces random cloudy white patches

GP -- Gulastra Plume -- a nontestable gene -- produces white starting at the bottom of the tail in bay based horses -- must be homozygous to show full effect, slightly lightens the tail of buckskin horses and puts some lighter flecks in the mane

Most of the rest, with more than two letters, are abbreviations of the names of Rank Special Herd Helpers, or sometimes just relatively uncommon but desirable ones.

TBB would be True Breeding Black, for instance.

I'm not sure. I know Ammit introduced True Breeding Blacks not long ago. I think there was a True Breeding Brown back in the days when Brown was created by making bays with homozygous sooty, but the name of that Herd Helper has been changed to True Breeding Dark Bay, though the tattoo may still have the original name.

Thanks, guys!

Sandy, that was really helpful. Answered everything I wanted to know. Thank you!

Sorry, Ammit. My memory is going. I thought I'd seen one recently, but obviously not. Sigh.