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A reminder
Fun fact: There are actually set waving patterns for different time signatures so that a glance at the conductor will also tell which beat of the bar is currently being marked, not just when the beat is.
I remember seeing demonstrations or illustrations many, many years ago for common time signatures like 4/4, 3/4 and 2/2, but don't remember what those are.
I don't remember being shown patterns for more exotic signatures like 5/4 or 9/8, but they must exist.
Of course, if you've ever played in an orchestra or band, this is second nature. For the rest of us, it's kind of neat that conductors basically have their own sign language.