Strap
A strap, sometimes also called strop, is an elongated flap or ribbon, usually of fabric or leather.
Thin straps are used as part of clothing or baggage, or bedding such as a sleeping bag. See for example spaghetti strap, shoulder strap. A strap differs from a belt mainly in that a strap is usually integral to the item of clothing; either can be used in combination with buckles.
Straps are also used as fasteners to attach and bind items, to objects, animals (for example a saddle on a horse) and people (for example a watch on a wrist), or even to tie down people and animals, as on an apparatus for corporal punishment. Occasionally a strap is specified after what it binds or holds, e.g. chin strap.
Packaging
Strap is commonly used in the packaging industry to secure or fasten items. It may be made from a wide range of materials, such as plastic, steel, paper, or fabric. Usually the strap is secured to itself through various means, but it may also be secured to other items, such as pallets.
Strops
Usage of the term strop is currently most often in reference to a band of leather used to polish the edge of Straight razor. The strop is usually loaded with a polishing compound to facilitate this process.
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