'If' versus 'Iff'

[Tom]

Hi

Could you please tell me if I can use Iff as freely as I can use If. I think Iff means 'If and only iff'

Tom

[Alan]

Hi Tom,

Sorry, never heard of it!

Alan
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English as a Second Language
You can read my ESL story Three Letters for You?

[Tamara]

[Mister Micawber]

.
Too erudite for general usage, Tom. It is just a mathematical acronym.
.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber

[Jamie (K)]

They also use iff in philosophy and linguistics. The average person walking down the street doesn't know what it means.