chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

argonon, inert gas, noble gas - any of the chemically inert gaseous elements of the helium group in the periodic table

Hebraic alphabet, Hebrew alphabet, Hebrew script - a Semitic alphabet used since the 5th century BC for writing the Hebrew language (and later for writing Yiddish and Ladino)

alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters"