Ss vs Hms - What's the difference?
As a noun ss
As an initialism hms is
(uk|nautical|military) her (or his) majesty's ship — ship prefix of the royal navy of the uk.
Screw Steamer - screw-driven steamship
(US, Navy) Sub Surface - diesel powered attack submarine
(military, rocketry) NATO prefix-code for surface-to-surface missile systems developed by the Soviet Union
* (submarine) SSN , SSG , SSGN , SSB , SSBN , SSK , APSS , LPSS
* (NATO) CSS
(UK, nautical, military) Her (or His) Majesty's Ship — ship prefix of the Royal Navy of the UK
Her (or His) Majesty's Service