We'll stop short of saying anything other than this is simply a cross that's stopped short.
The Humetty Cross (hu-met'-tay) is the name given to any ordinary heraldic cross where the arms are shortened so that its extremities do not touch the sides of a escutcheon (shield), crest, flag or some other frame.
This cross form is also known as Couped or Coupé, (French: Alisée, Alaisée or Alésée). There are various spellings but Humetty and Humettée seem to be the most common.
Examples of humetty crosses are seen in the Red Cross emblem, the flag of Switzerland, and the Green Cross First Aid symbol.