Which of the following is a variation of the Square Knot?

The Square Knot, also known as the Reef Knot, is primarily used for tying two ends of rope together. A variation of the Square Knot is the Grief Knot, which is used, among other things, to secure a package. It forms a secure bind, but it is designed so that it can be easily untied. Understanding the functionality of the Grief Knot as a variation of the Square Knot underlies its design purpose, where both knots serve similar basic applications in binding, but with slight differences in their methods and ease of untangling.

The Slip Knot, for instance, is typically used for making loops that can be easily adjusted, while the Bowline is known for creating a fixed loop that will not slip under load. The Grunt Knot, on the other hand, is less commonly referenced and is not typically recognized as a variation of the Square Knot, aligning these with their specific uses rather than resembling the structure of the Square Knot itself.