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Real-Time Operating System
abbr., file.ext.	RTOS
real-time operating system
IT	RTOS system (MichaelBurov)
Real Time Operating System
IT, abbr.	RTOS (OS, Interdata, Prime)
real-time operating system
progr.	real-time OS (ssn)
real time operating system
IT	RTOS system (MichaelBurov)

Real: 5 phrases in 3 subjects

Abbreviation	1
Business	1
Trademark	3