Greatbow (5e Equipment)
From D&D Wiki
Martial Ranged Weapons
A greatbow is an exceptionally tall longbow, often surpassing the height of the archer. The Japanese yumi, for example, has an asymmetric design in which the hand is placed one-third the height from the lower tip. This allows the bow to be fired from a kneeling position or from horseback.
Special. When using this weapon to attack a target within 20 feet, you have disadvantage on the attack roll.