When tying a square knot, each pigtail is secured with what type of knot?

When tying a square knot, each pigtail is secured with an overhand knot. The square knot itself is formed by tying two overhand knots in a specific manner, which involves tying the first knot with one working end going over the other and the second knot with the opposite working end following the same over-under approach.

Using an overhand knot ensures that the two ends of the rope are well secured to prevent slipping and creates a balanced structure. The simplicity and effectiveness of the overhand knot make it instrumental in creating the square knot, which is commonly used for tying two ropes together securely.

The other knot types listed do not fulfill the function of securing the pigtails in a square knot. A clove hitch is typically used to secure a rope to a post or a similar object, while a bowline knot creates a fixed loop at the end of a rope, and a figure eight knot is a strong knot often used in climbing and canyoneering, but does not serve the same purpose when constructing a square knot.