Computing and Internet
- Pac-Man, character, video game, and TV series
- Paper Mario, a series of role-playing video games
- Particle Mesh, an algorithm for calculating the potential of a system (used in computational physics).
- Perl module, a discrete component of software for the Perl programming language. (file extension .pm)
- Perl mongers - groups of local Perl enthusiasts.
- Personal message or private message, a type of e-mail within community sites or chat between two people.
- Power management, ability of some devices to reduce energy consumption
- Saint Pierre and Miquelon: ISO 3166-1 alpha-2 country code
- .pm, the country code top level domain (ccTLD) for Saint Pierre and Miquelon
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