n.a four-sided sail set beneath a horizontal yard suspended at the middle from a mast

Kelenderis Ship—Square or Lateen Sail?
Kelenderis Ship—Square or Lateen Sail?
["Square sail"flap in median nerve lesions at the wrist. Anatomical elements and review of twenty operated cases]
Square Rigged Sail Wind Turbine
Further investigation of the body torques on a square solar sail due to the displacement of the sail attachment points
Preliminary solar sail design and fabrication assessment: Spinning sail blade, square sail sheet
Tack (Square Sail)
Tack (Square Sail)
''Square sail'' flap in median nerve injuries at the wrist. Anatomy and review of twenty cases
'Big Ben', square sail of the yacht America (Schooner racing yacht, 1851)