SHU:

In the US Federal Prison system, solitary confinement is known as the Special Housing Unit. SHU is an acronym.

Solitary confinement is a special form of imprisonment in which a prisoner is isolated from any human contact, though often with the exception of members of prison staff. It is sometimes employed as a form of punishment beyond incarceration for a prisoner and has been cited as an additional measure of protection from the inmate or is given for violations of prison regulations.

Persian: انفرادی