What is the correct abbreviation of 'terms and conditions'? Is it Ts&Cs or is it T&Cs please?

I've never seen this expression abbreviated.

It seems to me to be important enough to spell out in full, so that someone later can't say 'Oh, I didn't know that was what your abbreviation meant.'

Best wishes, Clive
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It is often abbreviated as T&Cs. Ts&Cs might seem more correct, but it appears less in usage.

Clive, if you have a legal contract where "terms and conditions" turns up in almost every clause, it would be standard practice to abbreviate the term.

see your T&Cs for details

the symbol of the apostrophe is used to denote possession or missing letters...(of course, we all know what that letters mean, but that is presumptive)...therefore it should be t's and c's (capitalised and/or the "and" substituted with the ampersand sign)..because it is not a possessive nouns, merely a shortened version of two words

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The correct way is Ts & Cs.