The meaning of the Acronym R is...

R is

• Radiancy
• Rain
• Rankine Temperature Scale
• Relative Humidity

More Meanings For R:

• Return
• Relational
• RATFOR file ( FORTRAN preprocessor)
• Read
• Regional
• Reset
• Reply
• Reencoding
• Are
• Ring
• Repulsive
• Received solid signal
• Responder
• Riser
• Ring

R is also in:

• Amateur Radio
• Architecture
• Assembly
• Chat
• Databases
• File Extensions
• General
• Hardware
• Networking
• Security
• SMS
• Telecom