ðə ɡɹˈuːp dʒˈiː ɪz kˈɔːld ðə ɡˈeɪn ɡɹˈuːp, fˈaɪ ɪz ðə ɡˈeɪn fˈʌŋkʃən, ænd ðə vˈæljuː fˈaɪ ˈiː ɪz ðə ɡˈeɪn ʌv ˈiː ɪn sˌʌm ˈɪndᵻkˌeɪɾᵻd dᵻɹˈɛkʃən.
The group G is called the gain group, φ is the gain function, and the value φ(e) is the gain of e (in some indicated direction).