knot used to tie together two ropes of equal diameter. Also called reef knot.

Merriam-Webster Online Dictionary
square knot (noun)
a knot made of two reverse half-knots and typically used to join the ends of two cords - see knot illustration
square knot (Wikipedia)

A square knot is another name for a reef knot.

Square knot may also refer to:

  • Square knot, a type of square knot formed over two other strands, used in Macramé
  • Square knot (mathematics), a composite knot obtained by taking the connected sum of a trefoil knot with its reflection
  • Square knot insignia, embroidered cloth patches that represent awards of the Boy Scouts of America and Scout associations throughout the world
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