Luff—The fore edge of a sail.
Leach—The after edge of a sail.
Head—The upper edge of a sail.
Foot—The lower edge of a sail.
Peak—The upper outer corner of a triangular sail, also the upper corner of a jib or gaff topsail. In this book the more common name head is used. See sail plans.
Throat—The upper fore corner of a triangular sail, also called the nock.
Tack—The lower fore corner of a sail.
Clew—The after lower corner of a sail.
