1550s, from Middle French cube (13c.) and directly from Latin cubus, from Greek kybos a cube, a six-sided die, vertebra, perhaps from PIE root *keu(b)- to bend, turn..
The triangle illustrates the three elements a fire needs to ignite: heat, fuel, and an oxidizing agent (usually oxygen). A fire naturally occurs when the elements are present and combined in the right mixture, meaning that fire is actually an event rather than a thing. A fire can be prevented or extinguished by removing any one of the elements in the fire triangle. For example, covering a fire with a fire blanket removes the oxygen part of the triangle and can extinguish a fire.
The energy of the Fire element, and the traits of Fire signs Aries, Leo and Sagittarius. The element of Fire can't be ignored. Fire gives light and warmth. Without it, there's no chance at life. Fire signs are excitable, vital and enthusiastic. They command attention, whether they realize it or not. Let's keep it real ...