Technology
Articles about devices, tools, digital systems and innovation.
Programmer
Progressive scan
Progressive scan (video display method)
Project Athena
Proprietary software
Prosthesis
Prototype
Proximity fuze
Pseudocode
Pseudocode: informal notation for algorithms and program design
Public-key cryptography
Public-key cryptography: principles, history, and applications
Pump
Punched card
Punched tape
Punched tape: a historic data-storage medium
Puppet (software)
Puppy Linux
Puppy Linux — a lightweight, portable GNU/Linux distribution
Push-button
Push-button Switches: Types, Operation, Design, and Applications
PuTTY
PuTTY — a versatile SSH and terminal emulator
Puzzle video game
Q*bert
Qanat
QBasic
QBasic: Microsoft’s beginner-oriented BASIC interpreter and IDE
QNX
QNX: a microkernel real-time operating system for embedded devices
QRpedia
QRpedia: multilingual access to Wikipedia via QR codes
Quantum computer
Quantum computer: principles, architectures, and practical challenges
Quartz clock
Queue (abstract data type)
QuickTime
Quill
QWERTY
QWERTY keyboard layout
Radar
Radiator
Radiator (heat exchanger for heating and cooling)
Radio control
Radio-frequency identification
Radio-frequency identification (RFID): technology, components, uses and issues
Radiography
Radiography: principles, equipment, clinical uses and safety
Radioisotope heater unit
Radioisotope thermoelectric generator
Radiometer
Radiometer — instrument for measuring radiant energy
Railgun
Railgun: electromagnetic launcher for high-speed projectiles
Rainwater tank
Rainwater tank (rain barrel or water butt)
Random-access memory
Random-access memory (RAM): functions, types, history, and uses
Ransomware
Ransomware: malware that restricts access and demands payment
Raspberry Pi
Raspberry Pi: compact single-board computers for learning and projects
Raster graphics
Raster image processor
Raster Image Processor (RIP): function, types, and role in printing
Razor
Razor (personal grooming tool)
RC2
RC4
RC4 (Rivest Cipher 4): overview, design, history and security
RC5
RC5 (block cipher): design, parameters, and cryptographic role