C81 or C-81 may refer to :
*
''C81'' (album) (1981)
*
C-81 (Michigan county highway)
The county-designated highways in Michigan comprise a system of primary county roads across the US state of Michigan. Unlike the State Trunkline Highway System, these highways have alphanumeric designations with letters that correspond to one of ...
*
C-81 Reliant
The Stinson Reliant is a popular single-engine four- to five-seat high-wing monoplane manufactured by the Stinson Aircraft Division of the Aviation Manufacturing Corporation of Wayne, Michigan.
Design and development
The Reliant is a high-win ...
, a 1933 military aircraft
*
Campbell Airport
Campbell Airport is a public-use airport located two miles (3 km) southwest of the central business district of Grayslake, a village in Lake County, Illinois, United States. It is privately owned by Kane Illinois Properties, Inc.
Faci ...
's FAA LID code
*
Hodgkin's lymphoma
Hodgkin lymphoma (HL) is a type of lymphoma, in which cancer originates from a specific type of white blood cell called lymphocytes, where multinucleated Reed–Sternberg cells (RS cells) are present in the patient's lymph nodes. The condition wa ...
's ICD-10 code
*
NGC 6352
NGC 6352 (also known as Caldwell 81) is a globular cluster of stars in the southern constellation of Ara, located approximately from the Sun. It was discovered by Scottish astronomer James Dunlop on May 14, 1826. The cluster has a Shapley–Sa ...
's Caldwell catalog number
*
Ruy Lopez
The Ruy Lopez (; ), also called the Spanish Opening or Spanish Game, is a chess opening characterised by the moves:
:1. e4 e5
:2. Nf3 Nc6
:3. Bb5
The Ruy Lopez is named after 16th-century Spanish priest Ruy López de Segura. It is one o ...
's Encyclopaedia of Chess Openings code
{{Letter-NumberCombDisambig