what does [BBD] and [UE] stand for in subject line?

[Jim K.]

I appologize for my ignorance. What does [BBD] and [UE] stand for in subject line?
Googled a bit, could not find some useful explanation.
Thank's

[Mario]

It's a secret

[Jim K.]

uiuiui, company internal administration codes ...   

[Mario]

I use these subject line tags as notes to myself.
[BBD] stands for Behavior By Design, [NR] for not reproducible etc.

[Jim K.]

Ah, so I don't tax my brain on these abbreviations anymore and better will concentrate on the content (!) of the (most helpful, always interesting) threads...