What indicates which way a door opens?

The direction a door opens is indicated by its hinges and the way it swings. If the hinges are on the left side and the door swings towards you, it is a left-hand door; if the hinges are on the right and it swings towards you, it is a right-hand door. Additionally, a door that swings away from you will be labeled as left-hand reverse or right-hand reverse, depending on the hinge placement. The labeling helps in determining the door's orientation and accessibility.