What's a three-turn?
A three-turn is executed on one foot from an outside edge to an inside edge or an inside edge to an outside edge. The Skater turns in the direction of the curve.
There are eight 3 turns in all: one for each possible combination of direction (forward or backward), skating foot (left or right), and edge (inside or outside).
The turn is named for the tracing that it makes on the ice. It looks like the number three.
sources: www.isu.org & https://en.wikipedia.org/wiki/Glossary_of_figure_skating_terms
Last update on 12. March 2018 by Gudrun Wakolbinger.