beep [beeps](electronically produced tone) noun [UK: biːp] [US: ˈbiːp]
blip [blips](short sound of a single pitch) noun [UK: blɪp] [US: ˈblɪp]
whistle [whistles](sound made by whistling) noun [UK: ˈwɪs.l̩] [US: ˈwɪs.l̩]When he heard the whistle, he crossed the street. = Cuando oyó el pitido, cruzó la calle.