Anapest

anapaest (/ˈænəpiːst, -pɛst/; also spelled anapæst or anapest, also called antidactylus) is a metrical foot used in formal poetry. In classical quantitative meters it consists of two short syllables followed by a long one; in accentual stress meters, it consists of two unstressed syllables followed by one stressed syllable. It may be seen as a reversed dactyl. This word comes from the Greek ἀνάπαιστος, anápaistos, literally "struck back" and in a poetic context "a dactyl reversed"
[ Collected from Wikipedia ]