What is the critical landing point on a ski jump also known as?

The construction point (German: Konstruktionspunkt, which is were the K comes from), also known as the critical point, calculation point, calculation line, K-point and K-spot, is a line across a ski jumping hill which indicates the hill's steepest point in meters. It was formerly used to classify the size of a ski jumping hill, and to calculate the number of points granted by a given jump. Since mid-2004, the hills are instead measured in hill size.

For a jump on the calculation point, the athlete gets 60 points. For every meter short or beyond this mark the jumper receives fewer or more points. For example: On a K 120 hill (Calculation point 120 m) the meter value is 1.8 points. So a 122 m jump would be worth 63.6 points, a 118 m jump only 56.4 points. The distance points plus the judges marks result in the total score.

Nearly all competitions in the FIS Ski Jumping World Cup use large hills with a critical point between 120 and 130. The largest is Mühlenkopfschanze in Germany. In addition, there is a bi-annual FIS Ski-Flying World Championship, which is held in one of the world's five ski flying hills: Vikersundbakken in Norway, Letalnica Bratov Gorišek in Slovenia, Čerťák in the Czech Republic, Heini Klopfer Ski Jump in Germany and Kulm in Austria.