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"Sacred geometry," a set of mathematics that focuses on the beautiful and sublime elements of mathematics as evidence of cosmic harmonies. Often discussed among hippie/New Age types.

From Wikipedia: "Sacred geometry can be described as a belief system attributing a religious or cultural value to many of the fundamental forms of space and time."

See: The Golden Ratio, The Flower of Life pattern, etc.
"That flower is demonstrating hella sacred g."
"Have you seen her new tattoo? It's got a bunch of sacred g and skulls in it"
by contactballer October 24, 2013