hill size; HS
Ski jumping term for the distance from the take-off point to the K-point, used to classify jump hills.
このジャンプ台のヒルサイズは137メートルです。
The hill size of this ski jump is 137 meters.
Variant with interpunct; less common in running text.
Borrowed from English 'hill size', used as a technical term in ski jumping.