Square Knot 

SQUARE KNOT (Class 1, Joining Knot):
Purpose: The square knot is used to join the ends of two ropes of equal diameter together while under tension.
Tying the Knot:
Step 1: Holding one running end in each hand, place the running end in your right hand over the one in your left hand.
Step 2: Pull it under then back over the top of the rope in your left hand.
Step 3: Place the running end in your left hand over the one in your right hand and repeat as in Step 2.
Step 4: Dress the knot down and safety it off with an overhand knot on each side of the knot.
Checkpoints
-Two interlocking bights.
-The running ends are on opposite ends of the knot and on the same side of the standing end.
-Minimum 4” pigtails after the overhand safeties.