Square knot
From MeritBadgeDotOrg
This article is about the Square knot used to secure a rope or line around an object. Adult leader awards are also called "Square knots." 
Forty Knots, Special Knots, and Advanced Knots, for Cub Scouts (Wolf, Bear, and Webelos Scouts),
Scouts (Scout, Tenderfoot, Second Class, and First Class ranks and numerous merit badges),
Venturers (Ranger Award), and Sea Scouts (Apprentice, Ordinary, Able, and Quartermaster ranks).
Square knot  
 
Names  Square knot, Reef knot 

Typical use  Joining two ends of a single line to bind around an object. For example,

Caveat 

Releasing  Jamming 
Category  Binding knots 
Group  Basic knots 
Related  Thief knot, Granny knot, Grief knot, Surgeon's knot 
 
— Scouts BSA Handbook, 13th/14th eds., p. 365 
 
— The Ashley Book of Knots # 1204 and # 1205, p 220 
 
— The Ashley Book of Knots # 1402, p 258 
 Required for
 Wolf Adventure: Call of the Wild #5. Show how to tie an overhand knot and a square knot.
 Arrow of Light Adventure: Scouting Adventure #5a. Show how to tie a square knot, two half hitches, and a tautline hitch. Explain how each knot is used.
 Scout rank #4a. Show how to tie a square knot, two half hitches, and a tautline hitch. Explain how each knot is used.
 Tenderfoot rank #3a. Demonstrate a practical use of the square knot.
 SmallBoat Sailing merit badge #7a: a. Show how to tie a square (reef) knot, clove hitch, two half hitches, bowline, cleat hitch, and figureeight knot. Demonstrate the use of each.
 Sea Scout Apprentice rank #6. Marlinspike Seamanship. Using both large and small lines, tie and explain the use of the following knots: overhand, square, figure eight, bowline, two half hitches, clove hitch, sheet bend, and cleat hitch.
 Sea Scout SmallBoat Handler Course #13. Knots—Have class learn to tie overhand, square, sheet bend, bowline, clove hitch, two half hitches, and belaying to a cleat.
 Instructions
 Hold one rope end in each hand.
 Pass the right end over and under the rope in your left hand.
 Pass the rope end now in your left hand over and under the one now in your right.
 Tighten the knot by pulling both running ends at the same time.
 Lesson Videos
 How to Always Tie a Square Knot Correctly • Grog's Animated Knots: Reef (Square) (also shows the related surgeon's knot, granny knot, and thief knot) • Tying Square Knots • Firefighting Knots: Square • How to Tie a Square Knot for Sailing • Square Knot (includes a demonstration of what happens when the knot spills) • How to Tie the Square Knot (also talks about the thief knot and granny knot)
 Notes
 Remember: "Right over left, left over right, makes a knot tidy, and tight."
 The square knot comes untied easily and is not as strong as a sheet bend.
 The square knot is one of the Forty Knots.
 The square knot is used in tying the Mark II square lashing
 The standard shoelace bow is actually a slippery square knot (although sometimes tied as a slippery granny knot), as the second overhand knot is tied using a bight rather than with the ends of the string (see Ian's Shoelace Site's Standard Shoelace Knot and Animated Knots' Shoelace Bow Knot pages).
 See also
 References
 Ashley, Clifford (1944). The Ashley Book of Knots. Published by Doubleday & Company. Reprinted with amendments by Geoffrey Budworth (1993). ISBN 0385040253.