What is "eighty-eights"

Eighty-eights may refer to brush-footed butterflies in two genera:

• Diaethria, a genus of butterflies collectively known as "the Eighty-eights"
• Callicore, a genus with a number of species whose common names also include "Eighty-eight"
• Piano, a piano has 88 keys (52 white, 36 black), so it is sometimes called an "Eighty-eight"