My vet manual calls it the coronary band. I believe it's either "coronary band" or "coronet" (but not just "coronary" or "coronet band").

ETA:  I'm a geek and had to look into this more.  The word coronary can also refer to/is derived from crown (encircling), which would be why it's called a coronation when someone is crowned.

Last Edited By: NewHorseMommy Dec 23 11 5:36 AM. Edited 1 times.