Should map markers be called pins or markers?

"Markers" is probably the best technical term. "Pins" is probably the most common word in a non-technical, colloquial sense.

1. What do you call markers on a map?
2. What does pin mean on maps?

What do you call markers on a map?

Markers, waypoints, points, dots, flag, indicator: there are many names for these objects. A marker is simply a point object. It is a single point on the map, at a given location, elevation, and aspect.

What does pin mean on maps?

When you drop a pin in your exact location, you're saving the GPS coordinates of that spot. That way, when you share it with your friend, you're telling them exactly where you are - not the nearest street address (which might be miles away).