What did the abbreviation "RMS" stand for in the RMS Titanic in 1912?

The abbreviation RMS stood for Royal Mail Ship in the case of RMS Titanic in 1912. The ship was given this designation because it was contracted to carry mail for the British Royal Mail service. This title denoted that the Titanic was authorized to transport mail and provide postal services while at sea, making it a vital link in the postal network of that time.