epigraph
noun [ C ] literature specialized uk/ˈep.ɪ.ɡrɑːf/ us/ˈep.ə.ɡræf/
（诗歌、戏剧或书的卷首或章节前的）引言，卷首语
a saying or a part of a poem, play, or book put at the beginning of a piece of writing to give the reader some idea of what the piece is about