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> I seldomly hear this property mentioned by anyone else, so even if it scratches OT-ness

What does "OT-ness" stand for ?

Presumably "off-topic-ness"

Off-topicness

I could not find that in urban dictionary or google results.Is this commonly used in free software or open software mailing lists or did you just guessed it ?

OT for "Off-topic" is a very common abbreviation online, yes.

Is there a common abbreviation online for On-topic? If so, what is it?

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