Computing
- .par and .par2, Parchive file types containing recovery data used to fix other files
- .par, file type associated with Solid Edge document
- .par, platform archive files for Eclipse Virgo
- Page address register, the physical addresses of pages currently held in memory
- PAR, the Perl Archive Toolkit module for the Perl programming language
- Par (command), command to reformat paragraphs of text
- Positive acknowledgment with re-transmission, TCP/IP method of reliable data transmission
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