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What position does the 3 p refer to then ? :)

It's a 3,3'-T2.
There are many ways to write down a formula :)

It was an answer to a question on 3,5-Diiodo-L-Tyrosine. It's right above my post :)

Erm, 3,5-Diiodo-L-Tyrosine is definitely intended to be a precursor to T4 and subsequently T3 ? It's the L-Tyrosine with two iodine atoms attached. Product ads say it provides the thyroid with iodine...