Kali Yuga
Kali Yuga means the Time of Kali and is the fourth Yuga in Hindu lore.
The "esoteric symbol of Kali Yuga is the five-pointed star reversed, thus — the sign of human sorcery, with its two points (horns) turned heavenward, a position every Occultist will recognize as one of the "left-hand," and used in ceremonial magic.
— Helena Blavatsky, Pages From a Pre-Historic Period., The Secret Doctrine (1888)