The Euler jump was known as the half loop jump in International Skating Union (ISU) regulations prior to the 2018/19 season when the name was changed.
[1] Its invention has been attributed to both to Carl and Gustav Euler, two Austrian brothers who won the men's pairs competition at the 1900 European Championships,[2] as well as to Swedish figure skater Per Thorén, who won a bronze medal at the 1908 Olympics in London.
[4] The Euler is performed when a skater takes off from the back outside edge of one skate and lands on the back inside edge on the opposite foot.
It is only recognized as a listed jump when performed with a single rotation.
Figure Skating, two benefits of the name change are that it simplifies the notation system for judges and makes it easier for skaters to attempt three-jump combinations, even if single loop jumps are already a planned part of their programs or if they accidentally pop out of a previous loop jump.