Русско-англо-русский юридический словарь

In October, a prison hearing officer found Garcia guilty of all charges and sentenced him to 730 days in the Special Housing Unit (SHU)—the prison’s punitive segregation unit. (The Nation)

In the United States federal prison system, solitary confinement is known as the Special Housing Unit (SHU), pronounced like "shoe" (/ʃuː/). California's prison system also uses the abbreviation SHU, but it stands for Security Housing Units. (Wikipedia)

Special Housing Unit: A special area in a prison where inmates are kept separate from the rest of the prisoners. This is usually done as a punishment for breaking the rules or for safety reasons. Inmates in this unit have fewer privileges than other prisoners. (LSD.Law)