toeclip

noun3

1. •
   A clip attached to the front cage of a bicycle pedal, shaped like the toe of a shoe, designed to prevent the cyclist's foot from slipping off the pedal during the forward pedalling motion.
2. •
   A small metal piece that sticks up from a horse-shoe to better grip the horse's hoof
3. •
   A small tissue sample taken from the toe from an animal, typically of an amphibian, reptile, or small mammal, for individual identification, genetic analysis, disease screening, or population monitoring.