σημεῖα [15 times](noun pl neut acc) "Signs" is from semeion, which means "mark (by which things are known)," "a proof" (in reasoning), "sign (of the future)," "sign from the gods," "signal (to do things)," "omen," "portent," "constellations," and a "standard (flag)." - "Sign" is Greek word that means a "mark," "sign," or "proof." The word in Greek is used specifically to means a sign from the gods and it that sense, it means "omen," "portent," and "constellations," but it also means a "proof" in reasoning. The translation of "proof" often seems how Jesus uses it.