bird-bolt, burbolt (n.)
short blunt-headed arrow for shooting birds
LLL IV.iii.22 [Berowne to himself, of Cupid and the King] Thou hast thumped him with thy bird-bolt under the left pap
MA I.i.39 [Beatrice to Messenger, of Benedick] my uncle's fool ... challenged him at the bird-bolt [i.e. at an elementary level of archery]
TN I.v.87 [Olivia to Malvolio] to take those things for bird-bolts that you deem cannon bullets