In the US “sleet” is the term for a winter precipitation that occurs when snow falls through a layer of warm air and melts into water droplets, then re-freezes into ice pellets as it passes through colder air closer to the ground. In many other areas that were part of the British empire that precipitation is called “ice pellets” and “sleet” instead refers to a mix of snow and rain. In the US that’s called a “wintry mix.”
I’m in Ontario and would agree. But I’d also call say it’s sleet if it’s little ice pellets that move like sand. Probably because when it happens (which us rare for us) it oscillates between the phases several times in the same storm.