Biology and medicine •
Range of motion, or range of movement, the distance a joint can move between the flexed and extended positions •
Recurrent miscarriage, referring to multiple consecutive miscarriages •
Regenerative medicine, the process of replacing or regenerating human cells, tissues or organs to restore or establish normal function • Relative migration, in
gel electrophoresis •
Respiratory mechanics, the branch of human physiology focusing upon the bio-mechanics of respiration •
Rhabdomyolysis, a condition in which damaged skeletal muscle tissue breaks down, potentially leading to kidney failure •
Rhesus monkey, a species of Old World monkey native to South, Central and Southeast Asia •
Rhinitis medicamentosa, or rebound congestion •
Urinalysis, or "routine and microscopy", an array of tests performed on urine
Computing •
RealMedia, a data format provided by RealNetworks •
Relational model, a database model based on predicate logic and set theory •
Reset Mode (ANSI), an ANSI X3.64 escape sequence •
Resource Management, a service in Asynchronous Transfer Mode (ATM) networks •
Reuters Messaging, an instant messenger application •
rm (Unix), a Unix command for the removal of files
Physics • Faraday
rotation measure, in astrophysics •
Magnetic Reynolds number, a ratio used in magnetohydrodynamics •
Molière radius (Rm), in high energy physics
Vehicles •
AEC Routemaster, the traditional London bus •
China Railways RM, a Chinese steam locomotive •
Rail Motor, a self-propelled rail car •
SJ Rm, a Swedish locomotive ==Sport==