| Backset | The distance from the edge of the door to the center of the lock hole (typical 2-3/8" or 2-3/4") |
| Single Cylinder Deadbolt | Keyed lock on outside of door and thumb turn on inside. |
| Double Cylinder Deadbolt | Keyed lock on both outside and inside of door. |
| Left Hand Door | When facing the outside of the door the hinges are on your left. |
| Right Hand Door | When facing the outside of the door the hinges are on your right. |
| Keyed Entry | Knob or handle can be locked with a key |
| Deadbolt | Separate lock in addition to a knob or handle. |
| Privacy | Can be locked from the inside only. No keys. (for bathrooms and bedrooms). |
| Passage | Cannot be locked (for halls and closets). |
| Dummy | Knob only. Does not turn. (for inactive half of french doors). |