RS may refer to:
RSS (Rich Site Summary; originally RDF Site Summary; often called Really Simple Syndication) uses a family of standard web feed formats to publish frequently updated information: blog entries, news headlines, audio, video.
In telecommunications, RS-232 is a standard for serial communication transmission of data. It formally defines the signals connecting between a DTE (data terminal equipment) such as a computer terminal, and a DCE (data circuit-terminating equipment or data communication equipment), such as a modem.
RSA is one of the first practical public-key cryptosystems and is widely used for secure data transmission.
In mathematics, the RSA numbers are a set of large semiprimes (numbers with exactly two prime factors) that are part of the RSA Factoring Challenge.
RISC System/6000, or RS/6000 for short, is a family of RISC-based UNIX servers, workstations and supercomputers made by IBM in the 1990s.
RS-485, also known as TIA-485(-A), EIA-485, is a standard defining the electrical characteristics of drivers and receivers for use in serial communications systems.
RSA Insurance Group plc (trading as RSA, formerly Royal and Sun Alliance) is a British multinational general insurance company headquartered in London, United Kingdom.
rsync is a utility for efficiently transferring and synchronizing files across computer systems, by checking the timestamp and size of files.