(Australia, US, abbreviation, alt-of, initialism) Initialism of roadside mailbox: part of a postal system used in rural areas where several houses collect their mail from a cluster of mailboxes at the roadside.
Address: RMB 35 Beaumont Crescent, The Ridgeway, Queanbeyan. New South Wales 2620, Australia. 1997, Nicholas Polunin, Lynn M. Curme, World Who is Who and Does What in Environment & Conservation, page 103:
2005, Katy Mallett (editor), Photographers, Flora of Australia: Volume 44B: Poaceae 3, Australian Biological Resources Study, page x,
[…] The Centre for Crop Improvement, RMB 944 Calala Lane, Tamworth, New South Wales 2340.
Sid Fogg′s Coaches ([phone:] 4928 1088; www.sidfoggs.com.au; RMB 2324 Main Rd, Fullerton Cove)[…]. 2005, Paul Smitz, Australia & New Zealand on a Shoestring, page 94:
(UK, abbreviation, alt-of, initialism) Initialism of Royal Marine Base.