Hackamore n. : A halter consisting of a long leather or rope strap and headstall, -- used for leading or tieing a pack animal.

Example:
Jumping Hackamores- How can I hook up my english bridle to a Hackamore and how does it work?

Taxonomy
hackamore, bosal, horse, Hackamore Reinsman, rope, nose, noseband, sidepull, bitless bridle, designs, leather, headstall, mecate, reins, rope halter, fiador, cavesson, jaw.

Defination from the web:
hackamore designs are also popular for endurance riding. ... It has a long rope rein called a mecate and may also add a type of stablizing throatlatch called a fiador, which is held to the hackamore by a browband. ...