| Racquetball | Rahsaan Roland Kirk | Radiation angle |
| Radiation modeFor an optical fiber, Radiation mode or unbound mode is an unbound mode. In an optical fiber, a radiation mode is one having fields that are transversely oscillatory everywhere external to the waveguide, and which exists even at the limit of zero waveleng | Radiation patternIn telecommunication, the term radiation pattern has the following meanings: 1. The variation of the field intensity of an antenna as an angular function with respect to the axis. Note A radiation pattern is usually represented graphically for the far-fie | Radiation scatteringRadiation scattering is the deflection of radiation ( electromagnetic or products of nuclear decay) from its original path as a result of interaction or collisions with atoms, molecules, or larger particles in the atmosphere or other media between the sou |
| Radio equipmentRadio equipment As defined in Federal Information Management Regulations, any equipment or interconnected system or subsystem of equipment (both transmission and reception) that is used to communicate over a distance by modulating and radiating electromag | Radio fixIn telecommunication and position fixing, the term radio fix has the following meanings: 1. The locating of a radio transmitter by bearings taken from two or more direction finding stations, the site of the transmitter being at the point of intersection. | Radio horizonIn telecommunication, radio horizon is the locus of points at which direct rays from an antenna are tangential to the surface of the Earth. If the Earth were a perfect sphere and there were no atmospheric anomalies, the radio horizon would be a circle. |
| RadiometryIn telecommunication, radiometry is the science of radiation measurement. TABLE OF RADIOMETRIC TERMS Term Symbol Quantity Unit radiant energy Q energy joule (J) radiant poweraka optical power φ power watt (W) irradiance E power incident per unit area | RandomizerIn telecommunication, the term randomizer has the following meanings: 1. A device used to invert the sense of pseudorandomly selected bits of a bit stream to avoid long sequences of bits of the same sense. Note: The same selection pattern must be used on | Random numberIn statistics a random number is a single observation (outcome) of a specified random variable. Where no distribution is specified, the continuous uniform distribution on the interval [0,1) is usually, but not always, intended. In an informal sense, there |
| Rastafarianism | Radio frequency | Ralph Ellison |
| Rave party | Radiation pressure | Ramallah |
| Ramayana | Raffaello Santi | Radius of gyration |
| Razor wire | Radical Party | Rabindranath Tagore |
| Ram Mohan Roy | Rama | Raster image processor |
| Rambouillet Agreement | Range encoding | Rare mode |
| Rafael E. Núñez | Ramsay MacDonald | Radio telescope |
| Raspberry dumpling | Raspberry and cream tart | Ravenloft |
| Ray (geometry) | Randomness | Random sequence |
| Rancid | Ragnar Lodbrok | Randal L. Schwartz |
| Rainbow Six (video game) | Rajmund Kanelba | Racial quota |
| Rainforest | Radix | Rauni |
| Ranching | Racing | Ratbot |
| Rabbi | Race war | Raccoon |
| Rally racing | Rafflesia | Racquet |
| Radiant Silvergun | Ramstein | Ramstein Air Base |
| Raymond Hood | Ray Milland | Raclette cheese |
| Raiders of the Lost Ark | Raymond Queneau | Radio drama |
| RAM disk | Ragusa | Radiological weapon |
| Raymond Smullyan | Rational Recovery | Radiohalo |
| Rabat | Rambutan | Rabies |
| Raleigh, North Carolina | Rabbinic literature | Rayleigh number |
| Rank | Ra'annana | Rasterisation |
| Randy Shughart | Radio frequency induction | Rationality |
| Rapid Update Cycle | Radius of convergence | Rafael Sabatini |
| Raymond Burr | Radagast (Middle-earth) | Railway mania |
| Rambling Syd Rumpo | Ra | Ramsay |
| Radioactive Man | Ramon Muntaner | Randomization |
| Rational expectations | Rapture | Ramsey Campbell |
| Railroad Revitalization and Regulatory Reform Act | Rail Passenger Service Act | Raman spectroscopy |
| Ranges | Ramoth-Gilead | Rahab |
