CR3 or CR-3 may refer to:

Science and technology

Macrophage-1 antigen Macrophage-1 antigen (or integrin αMβ2 or macrophage integrin or Mac-1) is a complement receptor ("CR3") consisting of CD11b (integrin αM) and CD18 (integrin β2). The integrin α chain is noncovalently bound to the integrin β chain. It binds ...

, an immunological cell surface receptor for a complement component * CR3, an x86 microprocessor

control register A control register is a processor register which changes or controls the general behavior of a CPU or other digital device. Common tasks performed by control registers include interrupt control, switching the addressing mode, paging control, a ...

* CR3, a

raw image format A camera raw image file contains unprocessed or minimally processed data from the image sensor of either a digital camera, a motion picture film scanner, or other image scanner. Raw files are named so because they are not yet processed and the ...

used by Canon digital cameras since 2018

Transportation

* Cessna CR-3, a racing aircraft designed in 1933 *

Curtiss CR-3 Curtiss Aeroplane and Motor Company (1909 – 1929) was an American aircraft manufacturer originally founded by Glenn Hammond Curtiss and Augustus Moore Herring in Hammondsport, New York. After significant commercial success in its first decades ...

, a racing aircraft designed in 1921 * County Road 3 (disambiguation), several roads * Loyang MRT station, Singapore, station code CR3

Other uses

* The royal cypher ''C III R'' (sometimes written as ''CR III'') for ''Charles III Rex'' (

Charles III Charles III (Charles Philip Arthur George; born 14 November 1948) is King of the United Kingdom and the 14 other Commonwealth realms. He was the longest-serving heir apparent and Prince of Wales and, at age 73, became the oldest person to ...

, King) *

Crystal River 3 Nuclear Power Plant The Crystal River Nuclear Plant also called the Crystal River 3 Nuclear Power Plant, or simply CR-3, is a closed nuclear power plant located in Crystal River, Florida. The facility is currently being decommissioned and is transitioning to a SA ...

* CR3, a postcode district in the CR postcode area {{Letter-NumberCombDisambig