What knot creates a loop around a fixed location, such as a post or fence?

The half hitch knot is commonly used to create a secure loop around a fixed point, making it ideal for anchoring lines to posts, fences, or similar structures. It is simple to tie and can be easily adjusted, which is particularly useful when securing a line to a stationary object.

While other knots mentioned have specific applications, they may not provide the same functionality. The square knot is primarily employed for tying two ends of rope together and is not designed to create a loop around an object. The reefer's knot, similar to the square knot, is also meant for tying two pieces of rope together but is more secure and used in sailing contexts. The bowline knot indeed creates a fixed loop but is typically not used directly around a fixed object; instead, it is better suited for applications where a secure, non-slipping loop is required. Thus, the half hitch stands out as the knot suited for encircling a fixed location effectively.