allo

/AE1 L OW0/
interjection
  1. 1

    (representing Cockney or other accent) Hello.

    โ€œ'Allo, 'allo, 'allo! What's goin' on 'ere, then?โ€

Source: https://en.wiktionary.org/wiki/'allo, https://en.wiktionary.org/wiki/allo