Toggle, KNOT, and HASP are all types of fastening. Toggle is a fastening device consisting of two parts, one of which is a bar or rod that is inserted into a hole or slot in the other part. KNOT is a type of fastening created by tying a rope or string in a particular pattern. HASP is a type of fastening consisting of a metal loop with a hinged arm that is secured with a padlock or other locking mechanism. All three types of fastenings are commonly used in construction, engineering, and other industries.