(computing, historical) Acronym of Disk Operating System, a family of disk-based operating systems.
(US politics) Initialism of Department of State.
(military) Initialism of date of service.
(military) Initialism of date of separation.
(computing, Internet) Initialism of denial of service.
(sciences) Initialism of density of states.
(education) Initialism of director of studies.
plural of do
(music) plural of do