The great tube decal mystery - an interactive blog

So on the crammed rush hour tube everyone is very careful to avoid any eye contact with their fellow commuters that could be mistaken for an acknowlegement they exist. So with little to look out the windows at, you spend a lot of time staring at the ceiling or the ads. In doing so I have become aware of decals at the bottom of the route maps on the wall of the train that carry codes that I just can't seem to work out. I've googled a couple to no avail, so I thought I would see if anyone else had some good ideas.

All the info I have on these are they seem to be 'official', on more than just one line, and appear in series of 3 individual stickers. I can take a photo of the exhibit if this helps anyone! Leave a comment if you have any ideas.

Example 1: BattlS SC comS
Example 2: BIC SC DIC

Updated - here's a photo: