"sissonne [see-SAWN]: Sissonne is named for the originator of the step. It is a jump from both feet onto one foot with the exception of sissonne fermée, sissonne tombée and sissonne fondue, which finish on two feet. Sissonne may be performed petite or grande. The petites sissonnes are sissonne simple, sissonne fermée, sissonne ouverte at 45 degrees and sissonne tombée at 45 degrees. The grandes sissonnes are sissonne ouverte at 90 degrees, sissonne renversée and sissonne soubresaut."
Ballet Dictionary - ABT: https://www.abt.org/explore/learn/ballet-dictionary/