PSOS, ''PSOs'' or pSOS may refer to: *

pSOS (real-time operating system) pSOS (Portable Software On Silicon) is a real-time operating system (RTOS), created in about 1982 by Alfred Chao, and developed and marketed for the first part of its life by his company Software Components Group (SCG). In the 1980s, pSOS rap ...

Provably Secure Operating System Peter Gabriel Neumann (born 1932) is a computer-science researcher who worked on the Multics operating system in the 1960s. He edits the RISKS Digest columns for ACM '' Software Engineering Notes'' and ''Communications of the ACM''. He founded A ...

* Project Support Open Source * Protective services officers * The

Police Service of Scotland Police Scotland ( gd, Poileas Alba), officially the Police Service of Scotland (), is the national police force of Scotland. It was formed in 2013, through the merging of eight regional police forces in Scotland, as well as the specialist service ...

See also