R
Ram disk – RAM (random access memory) – Random access – Rascal – Ratfor – RCA 1802 – Read only memory (ROM) – REBOL – Recovery-oriented computing – Recursive descent parser – Recursion (computer science) – Recursive set – Recursively enumerable language – Recursively enumerable set – Reference (computer science) – Referential transparency – Register – Regular expression – Regular grammar – Regular language – RPG – Retrocomputing – REXX – RFC – RISC – RS/6000 – Ruby –
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