noun
RY
noun
1
A repeating test string of alternating R and Y characters, historically used to check that teleprinter and radioteletype equipment was working correctly.
"Technicians would transmit a long RY string to make sure the teleprinter was in sync."
How to Use RY
Learner’s notesIn plain EnglishA technical test signal, not a normal word — mainly of interest to people who work with old telecommunications equipment.
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Technicians would transmit a long _____ string to make sure the teleprinter was in sync.