thermodynamics - Confused why delta ∆Q and dQ don't make sense for heat Q - Chemistry Stack Exchange

In my chemistry teacher's notes, some notations concerning the heat $Q$ are marked as inappropriate. $Q$: yes d$Q$: no $\delta Q$: yes $\Delta Q$: no In the second bullet in the screenshot below

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HEAT TRANSFER dx dT Ak dt dQ − = TAh dt dQ Δ =

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