inverted circumflex

The story

From its earliest attested use as an idiomatic phrase in 1810, inverted circumflex was first used to denote a dipping tone — an inversion of the peaking tone denoted by ⟨῀⟩, the Ancient Greek περισπωμένη (perispōménē), commonly translated as “circumflex” — thence the name was applied to diacritics which marked such a dipping tone and, by extension, other tones to which it was suited; finally, due to such a diacritic’s resemblance to the háček, the name came to be applied to it as well.