(рлк.) запитний сигнал
tactical sign (tac-sign)
call sign (callsign)
collective call sign
conventional sign
marking sign
net call sign
tactical call sign
circular call sign
mine sign
BIO sign
crossing sign
deviation sign
aerodrome identification sign
sign
address call sign
call sign
gas warning sign
trail sign
visual call sign
voice call sign
warning sign
call sign (signal)
code sign
collective сall sign
recall sign
radio call sign
chemical contamination sign
hazard sign