Which flavor is indicated by the pump labeled "AM"?

The flavor indicated by the pump labeled "AM" is Amaretto. Amaretto is an almond-flavored liqueur, which aligns with the common practice of using the first two letters "AM" to represent the flavor. This convention often helps baristas and beverage professionals quickly identify flavor profiles during busy service times.

Almond is indeed related but may not be the specific flavor assigned to that label. Butterscotch and chocolate are distinct flavors that do not correlate with "AM." Consequently, Amaretto is the correct answer, as it directly signifies the almond flavor profile represented in many beverage formulations, especially those served in cafes and coffee shops like Viridian Coffee Co.