This function  is often referred to as the electrostatic potential energy of the system of charges in  (with reference to the zero-of-potential ).
ðɪs fˈʌŋkʃən ɪz ˈɔfən ɹᵻfˈɜːd tʊ æz ðɪ ɪlˌɛktɹoʊstˈæɾɪk pətˈɛnʃəl ˈɛnɚdʒi ʌvðə sˈɪstəm ʌv tʃˈɑːɹdʒᵻz ɪn wɪð ɹˈɛfɹəns tə ðə zˈiəɹoʊʌvpətˈɛnʃəl.