The standard lunar orbit for Apollo missions was planned as a nominal  circular orbit above the Moon's surface.
ðə stˈændɚd lˈuːnɚɹ ˈɔːɹbɪt fɔːɹ ɐpˈɑːloʊ mˈɪʃənz wʌz plˈænd æz ɐ nˈɑːmɪnəl sˈɜːkjʊlɚɹ ˈɔːɹbɪt əbˌʌv ðə mˈuːnz sˈɜːfɪs.