Other uses of the signal include the police who sometimes use a recognition signal so that officers in uniform can recognize officers in normal clothing (undercover). The NYPD often use headbands, wristbands or colored clothing as recognition signals which are known as the "color of the day".
ʌ ð ə ɹ WORD_BOUNDARY j uː s ɪ z WORD_BOUNDARY ʌ v ð ə WORD_BOUNDARY s ɪ ɡ n ə l WORD_BOUNDARY ɪ ŋ k l uː d WORD_BOUNDARY ð ə WORD_BOUNDARY p ə l iː s WORD_BOUNDARY h uː WORD_BOUNDARY s ʌ m t aɪ m z WORD_BOUNDARY j uː s WORD_BOUNDARY ʌ WORD_BOUNDARY ɹ ɛ k ə ɡ n ɪ ʃ ə n WORD_BOUNDARY s ɪ ɡ n ə l WORD_BOUNDARY s oʊ WORD_BOUNDARY ð æ t WORD_BOUNDARY ɑ f ɪ s ə ɹ z WORD_BOUNDARY ɪ n WORD_BOUNDARY j uː n ɪ f ɔ ɹ m WORD_BOUNDARY k æ n WORD_BOUNDARY ɹ ɛ k ə ɡ n aɪ z WORD_BOUNDARY ɑ f ɪ s ə ɹ z WORD_BOUNDARY ɪ n WORD_BOUNDARY n ɔ ɹ m ə l WORD_BOUNDARY k l oʊ ð ɪ ŋ WORD_BOUNDARY ʌ n d ə ɹ k ʌ v ə ɹ WORD_BOUNDARY ð ɪ WORD_BOUNDARY ɛ n w aɪ p iː d iː WORD_BOUNDARY ɔ f ə n WORD_BOUNDARY j uː s WORD_BOUNDARY h ɛ d b æ n d z WORD_BOUNDARY ɹ ɪ s t b æ n d z WORD_BOUNDARY ɔ ɹ WORD_BOUNDARY k ʌ l ə ɹ d WORD_BOUNDARY k l oʊ ð ɪ ŋ WORD_BOUNDARY æ z WORD_BOUNDARY ɹ ɛ k ə ɡ n ɪ ʃ ə n WORD_BOUNDARY s ɪ ɡ n ə l z WORD_BOUNDARY w ɪ t̠ʃ WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY n oʊ n WORD_BOUNDARY æ z WORD_BOUNDARY ð ə WORD_BOUNDARY k ʌ l ə ɹ ɹ WORD_BOUNDARY ʌ v ð ə WORD_BOUNDARY d eɪ WORD_BOUNDARY