- Battens
- Long thins strips of usually either fibreglass or wood used to support the sail
- Clew
- Bottom aft corner of a sail
- Foot
- Bottom edge of a sail
- Head
- The top of a sail
- Leech
- Aft edge of a sail
- Luff
- Front leading edge of a sail
- Roach
- Sails are not usually a perfect triangle and include an additional curved area on the leech of a sail, called a roach. A roach provides extra power to a sail
- Run
- A Run, or sometimes just referred to as “Running Downwind”, is a precise point of sail and is when a boat is sailing directly downwind. The sails need to be eased out fully to be at their most efficient. This point of sail will feel the most relaxed out of the all the points of sail as you're travelling with the wind instead of against it
- Tack
- An act of changing course by turning a boat's head into and through the wind, so as to bring the wind on the opposite side
- Tell Tales
- Light strips of material attached to the sail to indicate whether the air stream on the sail surface is smooth or turbulent