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Reference.org
PDOS
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<p>PDOS is an abbreviation that may refer to: </p> <ul><li><a href="/facts/PDOS_(operating_system)/5vrf7YQT">PDOS (operating system)</a>, a discontinued multiuser multitasking operating system</li> <li><a href="/facts/Permanent_denial-of-service_attack/6nkoK02J">Permanent denial-of-service attack</a>, a cyber attack overloading a service so badly that it requires replacement</li> <li>Projected <a href="/facts/Density_of_states/bwVTyhTf">density of states</a>, a projection of the number of modes per unit frequency range</li></ul>