A symbol that is used to represent the male is the shield and spear of the Roman God Mars, with the spear pointing North East. In Greek Mythology. Mars is the god of WAR so it’s associated with men.
In astrology, Mars influences all things masculine, and filtered through its particular sign reveals how anything is pursued, from a potential sexual partner to a career.
Also, this alchemical symbol for iron, represents the male sex:
Iron is a most abundant metal, and is believed to be the tenth most abundant element in the universe. As such, iron rules physical strength, and symbolizes predominantly male energy. Philosophically, iron represents a need to temper primal urges while at the same to embracing the fire within.