Spot where bowlers place ball upon delivery, midway between right corner and center of lane and three-fourths of the width of the lane from the left corner (vice versa for lefties). A popular starting point.
Three-quarters was old rhyming slang for the neck (peck).
A stage position in a proscenium theatre, where the actor is facing half-way toward the actor to their side and half-way toward the audience. Thus the audience is essentially seeing a three-quarter view of the actor.