Definition: The term "Indigo1" refers to a rare, vibrant purple hue in plants. It's named after the Greek god Indra who was known for his red-colored clothes. This color is often used in religious symbolism, representing a deep, unyielding strength or courage. The exact meaning of "indigo1" has been lost through centuries and it's speculated that it may represent a spiritual quality that's hard to define but can be seen as a symbol of truth and the unknown.