"Lefty" can refer to several things, including Lefty, a data-driven influencer marketing platform; Lefty Ruggiero, a mobster featured in the film Donnie Brasco; and Lefty Cray, a scientist who worked with anthrax at the Army's biological warfare lab. It could also refer to the video game Lefty on Steam, the restaurant Lefty's on the Square, or the band Lefty.