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TTY Abbreviations

Commonly used abbreviations:

BRB Be Right Back
CA Communications assistant (another term for a relay operator)
CU See You (be seeing you)
GA Go Ahead
SK Stop Keying
GA OR SK, GASK Goodbye
SKSK Now hanging up
HD Hold (transmitted before a voice intercept message)
Q, QQ, QM Question Mark (?)
PLS Please
RO Relay Operator
OIC Oh, I See
OPR Operator
NBR Number
TMW Tomorrow
THX Thanks
WRU Who are You? (or Where are You?)
XXXX Xs are often used to indicate a typing error instead of backspacing