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You order this drink like you'd do a coffee, caffè macchiato / caffè corretto i.e. The coffee is base ingredient which is always present and therefore used first, the second part is the addition that can differ and makes into that specific combo.

In this case you would order an spritz Aperol or the (less popular) other option, spritz Campari. Spritz in this case refers to the bubbles from the prosecco and sparkling water / soda that's used to make the mix drink together with either Aperol or Campari.

You can easily recognize the difference between the two as the Campari is red vs the orange of the Aperol.