RRRR may refer to: * the reporting mark for the Rock and Rail LLC *

Raritan River Railroad The Raritan River Rail Road was a shortline railroad in Middlesex County, New Jersey, Middlesex County in the U.S. state of New Jersey, Founded in 1888, it was based in South Amboy, New Jersey, South Amboy, from which it ran west as far as Ne ...

* the

morse code Morse code is a telecommunications method which Character encoding, encodes Written language, text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code i ...

for surface raider, used in conjunction with

SOS SOS is a Morse code distress signal (), used internationally, originally established for maritime use. In formal notation SOS is written with an overscore line (), to indicate that the Morse code equivalents for the individual letters of "SOS" a ...

See also