Laurence F. Sheldon, Jr. just gave a great cable tag definition on the NANOG mailing list.

The tags should have a short (two or three word) description, the authority for the patch (person's name or position, order number, or trouble ticket number) and where the other end of the patch is, followed by where this is. (For short cords "this" will cover both ends, probably.

This was too long to tweet, so here it is.