Rational egoism is the view that rationality consists in acting in one's self-interest (without specifying how this affects one's moral obligations).
ɹˈæʃənəl ˈiːɡoʊˌɪzəm ɪz ðə vjˈuː ðæt ɹˌæʃənˈælᵻɾi kənsˈɪsts ɪn ˈæktɪŋ ɪn wˈʌnz sˈɛlfˈɪntɹɛst wɪðˌaʊt spˈɛsᵻfˌaɪɪŋ hˌaʊ ðɪs ɐfˈɛkts wˈʌnz mˈɔːɹəl ˌɑːblɪɡˈeɪʃənz.