swallowtail

noun4

1. •
   The forked tail of a swallow.
2. •
   Any of various butterflies of the family Papilionidae, many of which have a long extension to each hindwing.

   • Claudette visit me […] and the biggest, most beautiful black-and-yellow Jamaican swallowtail butterfly follow behind she, like it give us it little blessing. — 2020
3. •
   Anything, such as a burgee, of a similar forked shape.
4. •
   A type of tailcoat with two long tapering tails.