In informal settings, Rear Admirals (Lower Half) are typically referred to simply as "Admiral."
A Rear Admiral (Lower Half) may be also referred to as a "one-star Admiral" to distinguish it from the other ranks of Admiral, so named for the one star rank insignia worn on the uniform.
- The name comes from the old sailing times. For large fleets, the "Rear Admiral" would be in charge of commanding ships at the rear.
- Rear Admirals were formed from the former rank of Commodore, which fell out of use in the 19th and 20th centuries. Commodores typically led small sized battlegroups of ships, although Captains could also perform this role in the absence of a flag officer.