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Register file
A register file is the processor circuit that holds a CPU's general-purpose registers and provides the read and write ports used to supply operands and store results.
Register renaming
Register renaming is a technique in out-of-order processors that rewrites architectural register names onto physical registers, eliminating false dependencies so independent instructions can execute in parallel.
Register-transfer level
Register-transfer level (RTL) is an abstraction level of digital circuit design in which a circuit is described as registers plus the data paths that transfer values between them.
Registered jack
A registered jack, or RJ connector, is a standardized telecommunication network interface for connecting customer voice and data equipment to a carrier service, with designations like RJ11 and RJ45.
Registered mail
Registered mail, also called registered post, is a secure postal service for valuable items, accepted against a receipt, tracked at every step, and delivered only against a signature.
Registered memory
Registered memory, also known as buffered memory or RDIMM, buffers command and address signals to reduce electrical load, and is the standard memory of enterprise servers and data centers.
Registered user
A registered user is a person who has created an account with a computer system or online service, supplying stored identifying information, unlike anonymous or guest visitors.
Regrasping
Regrasping is a robotic manipulation skill in which a robot's hand or gripper changes an object's orientation or grip positions until the desired configuration is reached.
Regression testing
Regression testing is testing performed after software or its environment is modified, checking that unchanged parts still work and that no new defects were introduced.
Regressor identifiability analysis
Regressor identifiability analysis is the study of which parameters of a robot's dynamic model can be estimated from measured motion and torque data, yielding the minimum base parameter set.
Regret bound
A regret bound is a theorem in online learning limiting how much worse an algorithm's cumulative loss can be than the best fixed strategy chosen in hindsight.
Regret matching
Regret matching is an adaptive rule for choosing actions in repeatedly played games, introduced by Hart and Mas-Colell in 2000, whose play converges to correlated equilibria.
Regular expression
A regular expression (regex or regexp) is a notation for describing sets of character strings, introduced by Stephen Kleene in 1956 and implemented by Ken Thompson in 1968.
Regularized zero-forcing
Regularized zero-forcing, also called MMSE precoding, is a linear precoding technique for multiuser MIMO wireless systems that adds a regularization parameter to trade interference cancellation against noise enhancement.
Regulation (EU) 2021/664
Regulation (EU) 2021/664 is the EU regulation adopted in April 2021 that establishes the U-space, designated airspace zones where drones may operate only with digital services.
Regulation (EU) 2023/1230
Regulation (EU) 2023/1230 is a European Union regulation on machinery, adopted in June 2023, which repeals the Machinery Directive and applies from 20 January 2027.
Regulation and licensure in engineering
Regulation and licensure in engineering is the system by which governments decide who may practice engineering, led by the Professional Engineer license, first granted under a 1907 Wyoming law.
Regulation of algorithms
Regulation of algorithms is the set of laws, standards, and enforcement mechanisms authorities apply to algorithmic and AI systems, exemplified by the EU AI Act, effective from 2024.
Regulation of artificial intelligence
Regulation of artificial intelligence, or AI regulation, is the body of laws governments apply to AI systems, led by the EU's risk-based AI Act, in force since 2024.
Regulation of artificial intelligence in the United States
Regulation of artificial intelligence in the United States, also called AI legislation in the United States, has no comprehensive federal statute and rests mainly on state laws.
Regulation of flight training organizations
Regulation of flight training organizations covers how national aviation authorities approve and oversee pilot training providers, including FAA Part 141 schools and EASA Approved Training Organisations.
Regulation of Interception of Communications and Provision of Related Information Act, 2002
The Regulation of Interception of Communications and Provision of Related Information Act, 2002, known as RICA, is a South African law regulating communication interception, best known for mandatory SIM card registration.
Regulation of the Tisza
The Regulation of the Tisza (Tisza-szabályozás) was a 19th-century engineering program, launched in 1846 under Count István Széchenyi, that straightened the Tisza River across the Great Hungarian Plain.
Regulation of UAVs in the United States
Regulation of UAVs, or drones, in the United States is governed by the FAA: recreational flying under a statutory exception and commercial operations under Part 107, effective 2016.
Regulation of ultralight and microlight aircraft
Ultralight and microlight aircraft are small airplanes under light-touch rules that differ by country: US ultralights are single-seat and uncertified, European microlights heavier and certificated.
Regulation of unmanned aerial vehicles
Regulation of unmanned aerial vehicles (UAVs, or drones) is the body of rules governing where and how drones may fly, including registration, pilot certification, and remote identification.
Rehabilitation robotics
Rehabilitation robotics: medical robots with actuated applied parts that deliver therapy, assessment, or assistance after stroke and spinal cord injury. Also called robot-assisted rehabilitation; device classes include exoskeletons, end-effectors, and exosuits.
Rehman Oil and Gas Field
Rehman is a tight natural gas field in Dadu District, Sindh, Pakistan, discovered in 2009 and producing since 2013, operated by PGNiG (now ORLEN) with Pakistan Petroleum.
Reichenau Abbey
Reichenau Abbey, German Kloster Reichenau, was a Benedictine monastery founded in 724 by Pirmin on Reichenau Island in Lake Constance, Germany, and a leading intellectual center of the Holy Roman Empire.
Reichstag building
The Reichstag building (Reichstagsgebäude) in Berlin is the seat of the German Bundestag, built from 1884 to 1894 by Paul Wallot, burned in 1933, and rebuilt in the 1990s by Norman Foster with a glass dome.