Research and Technology Organization 
Responsible Test Organization 
Registered Training Organisation 
Research and Technology Organisation 
Radio Telephone Operator 
rapid thermal oxidation 
regenerative thermal oxidizer 
Rail Transport Officer 
Real Time Optimization 
Recovery Time Objective 
Rent To Own 
Reuse Target Offset 
Arhabaev Tourism Airlines 
Radio Transmitter Operator 
rail transportation office 
rail transportation officer 
Railway Transport Officer 
Railway Transportation Officer 
Range Training Officer 
Rapid Turn-on 
reactor trip override 
Ready To Order 
Real-Time Operation 
Recovery Time Objectives 
Referred to Output 
Regenerative Thermal Oxidation 
regenerative thermal oxidizers 
Regional Tourism Organization 
Regional Transmission Organization 
Registered Training Organisations