N.Y. Comp. Codes R. & Regs. tit. 7 § 300.2 : DEPARTMENT OF CORRECTIONS AND COMMUNITY SUPERVISION — Special Housing Units — General Provisions — [Effective 4/24/2023] Definition

(a) The superintendent may, by written order, designate certain areas or cells as special housing units. A copy of any such designation shall be transmitted to the commissioner immediately for approval by the commissioner or his designee.
(b) A special housing unit (SHU), in maximum security facilities as well as in designated medium security facilities, shall consist of single- or double-occupancy cells grouped so as to provide separation from the general population, and may be used to house inmates confined to such units pursuant to Part 301 of this Title as well as such other inmates as approved by the commissioner or his designee.

N.Y. Comp. Codes R. & Regs. Tit. 7 § 300.2