WordNet sense 1 (a plaything consisting of a Y-shaped stick with elastic between the arms; used to propel small stones):

catapult, slingshot

WordNet sense 2 (a shoe that has a strap that wraps around the heel):

slingback

WordNet sense 3 (bandage to support an injured forearm; consisting of a wide triangular piece of cloth hanging from around the neck):

scarf bandage, triangular bandage