What is an apostrophe in drama?

I wonder if you mean 'antistrophe'.

In ancient Greek Drama the chorus delivering an ode would move across the stage in one direction (the strophe) and then turn and move in the opposite direction (the antistrophe).

But since in rhetoric an apostrophe means a diversion or digression, I suppose that the turning point when the chorus switches from strophe to antistrophe could be considered an apostrophe too.