Reef Knot

The Reef Knot, also known as the Square Knot, is one of the oldest and most recognized knots in maritime history.

Simple, elegant and effective, it’s used to tie two ropes of equal thickness together - once essential for reefing and furling sails aboard traditional sailing ships.

Its balanced, symmetrical shape makes it both practical and iconic. While modern sailors still use the Reef Knot for light-duty applications such as securing sails, lines or gear, its true legacy lives on as a timeless symbol of seamanship, trust and unity.

Sailor’s note: The name “Reef Knot” comes from its original purpose — reefing sails to reduce their area in strong winds. Centuries later, it remains one of the first knots every sailor learns and never forgets.