Physical restraint refers to the practice of rendering people harmless, helpless or keeping them in captivity by means such as handcuffs

Handcuffs

Handcuffs are restraint devices designed to secure an individual's wrists close together. They comprise two parts, linked together by a chain, a hinge, or rigid bar. Each half has a rotating arm which engages with a ratchet that prevents it from being opened once closed around a person's wrist...

, fetters

Fetters

Legcuffs, shackles, footcuffs, fetters or leg irons are a kind of physical restraint used on the feet or ankles to allow walking but prevent running and kicking. The term "fetter" shares a root with the word "foot"....

, straitjacket

Straitjacket

A straitjacket is a garment shaped like a jacket with overlong sleeves and is typically used to restrain a person who may otherwise cause harm to themselves or others. Once the arms are inserted into the straitjacket's sleeves, they are then crossed across the chest...

s, rope

Rope

A rope is a length of fibres, twisted or braided together to improve strength for pulling and connecting. It has tensile strength but is too flexible to provide compressive strength...

s, strap

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...

s, or other forms of physical restraint. Alternatively, unarmed combat techniques or sheer force of numbers may be used to restrain a person.
British Police officers

Police officer

A police officer is a warranted employee of a police force...

 are authorised to use leg and arm restraints, if they have been instructed in their use.