[blml] abbreviations

[Jeff Easterson]

Here are somemore abbreviations which have appeared in the past week or 
so but are not on the blml list:

ISTM
IMOBO
BDSM
BTA

And, incidentally, what does SEC (unofficial) mean?  Why is it placed 
after the communication title?  And, I think (am unsure) that it is 
sometimes some other term as "unofficial".  This was probably explained 
at one time or another so older, veteran, blmlers can probably supply me 
with an explanation.
And, an afterthought. When talking about blml/blmlers; how is it 
pronounced?  Billmill?  Bullmull? Bllmll? blml?  Bellmell?  Blemle?
Ciao, JE