given that 'off-topicness' is indicated as '[OT]' and taking a look at
those postings that started the threads indicated as '[OFF]' (which may
both be seen as being somewhat offensive) may lead to the conclusion
that '[OFF]' stands for offensiveness.
I don't think that this is the intended meaning so what actually *does*
'[OFF]' mean? I never came across that abbreviation before (although I
have been around on the USENET for quite some time) but maybe it is