In town and country planning in the United Kingdom, C2 is the code for permission to use specific land or premises for residential institutions

C2 is an abbreviation for double-person Sprint Canoe.

Citroën C2, a car produced by Citroën in 2004

ISO 216 C2 international standard paper size (458×648 mm)

TCSEC C2 security class

Vitamin C2, a name sometimes used for Choline

C-2 Greyhound, The Grumman cargo aircraft of the United States Navy

USS Charleston (C-2), a protected cruiser of the United States Navy

Cryptomeria cipher, a cipher used in digital rights management

C2 explosive, a form of plastic explosive

Air Luxor, C2 IATA code

Type C2 ship all-purpose cargo ships

C2 (radio), a Welsh language music show on BBC Radio Cymru

Coca-Cola C2, a soft drink launched by The Coca-Cola Company in 2004

USS C-2, a C-class submarine of the United States Navy

C2 (protocol), a file transfer protocol

ACAZ C.2, a Belgian prototype fighter aircraft of the 1920s

Deep C note in music, the C under the bass clef

AEG C.II, a German World War II armed reconnaissance aircraft

Command and control, a military term

HMS C2, a British C class submarine of the Royal Navy

Complement component 2

Second cervical vertebrae of the vertebral column, in human anatomy

Thomas Built Buses' Saf-T-Liner C2

C2.com, on which are hosted WikiWikiWeb and the Portland Pattern Repository

C2 (taser), a civilian model of an electrical stun weapon (taser) from Taser International