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"VE3" and "VA4"?I've seen a few of these on licence plates here in Ontario but I can only guess it means veterans. Anyone knows what it means?

This combined with this leads me to think that they're radio callsigns or something similar.

They're Ham Radio operators (amateur radio). It is a tradition to use callsigns for licence plates so they can talk as they pass each other on the highway. VE3 is the prefix for Ontario ham licences, VA4 or VE4 is Manitoba.