♧⌞ Lacuna ⌝♧ ✥ Chongyun x Xingqiu ✓

lacuna /ləˈkjuːnə/ noun noun: lacuna; plural noun: lacunae; plural noun: lacunas 1. an unfilled space; a gap. "the journal has filled a lacuna in Middle Eastern studies" a missing portion in a book or manuscript.