Hidden letters in Agadmator's videos

Probably off topic but still chess-related so I thought it should be posted here:

Does anyone know what is the meaning of the seemingly random yellow characters (letters) in the videos of Agadmator? They are always in the bottom right corner, on the head of a robot. The last characters from the videos on the channel are b, b, b, aA, C, R, C, S, B, E5 (order from newest to oldest video).

Also, there seems to be some mystery thing with the hashtag #2992 on his channel.

It's all very suspicious.

Curious to know your thoughts on that.

His blizzard username is agadmator#2992 which is where the #2992 comes from

The other letters are the type of game, B=Blitz, C=Classical, R=Rapid, etc

What about aA or E5?

Okay, I have it: E5 was in a game with so called "English Five" time format and aA is in the game played between two anonymous players (fictional in fact) so it's also something special. Anyway, I am really surprised that it's so simple, many thanks @RookToZ99 !

Chello everyhwone!

huh?