What is the name of the line that divides the rink in half?

The red line divides an ice hockey rink in half. More precisely, it is the red center line, also called the centre line in Canadian and international usage, and it runs across the middle of the ice.

The center line is different from the two blue lines. The blue lines divide the rink into three zones: one neutral zone in the middle and an attacking or defending zone at each end. The red line separates the two halves and is used in rules such as icing; depending on the league, it may also matter for other territorial or passing regulations.

There are also red goal lines near each end of the rink. Those lines sit behind the blue lines and help determine whether a puck has crossed the goal or whether an icing infraction has occurred. That is why “red line” can sometimes sound less precise than “center red line,” but it is the accepted answer to this quiz question.

Most NHL rinks measure 200 feet by 85 feet, with the center line positioned halfway along the rink's length.