The Center Line in Curling is a line that runs down the exact middle of the sheet, parallel to the whole sheet, from Hack to Hack through the exact middle of both buttons (and therefore houses).
The center line is a crucial tool to determine how much a shot is swinging one way or the other (or not) as it moves down the ice. The Skip uses the relative position of the stone to the center line, and the rate of change of that position to eyeball how much the stone is curling.
The center line also controls where the No-Tick rule is in effect (if it is in play).
Also Known As: Centre Line, Centerline
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