Minkowski - Spherical - ⊚ - {t,r,θ,φ}
	Minkowski - Cartesian - ⊞ - {t,x,y,z}
	Schwarzschild - Droste - ⊚ - {t,r,θ,φ}
	Schwarzschild - Droste - ⊞ - {t,x,y,z}
	Schwarzschild - Raindrop - ⊚ - {t,r,θ,φ}
	Schwarzschild - Finkelstein - ⊚ - {t,r,θ,φ}
	Schwarzschild - Finkelstein - ⊞ - {t,x,y,z}
	Reissner Nordström - Droste - ⊚ - {t,r,θ,φ}
	Reissner Nordström - Finkelstein - ⊞ - {t,x,y,z}
	Kerr - Boyer Lindquist - ⊚ - {t,r,θ,φ}
	Kerr - Doran - ⊚ - {t,r,θ,φ}
	Kerr - Kerr Schild - ⊚ - {t,r,θ,φ}

	Kerr Newman - Boyer Lindquist - ⊚ - {t,r,θ,φ}
	Kerr Newman - Kerr Schild - ⊞ - {t,x,y,z}
	Gödel Universe - Cylindrical - ▭ - {t,r,φ,z}
	Static Weak Field - Spherical - ⊚ - {t,r,θ,φ}
	Rotating Charged Weak Field - Spherical - ⊚ - {t,r,θ,φ}
	FLRW - Comoving - ⊚ - {t,r,θ,φ}
	FLRW - Comoving - ⊞ - {t,x,y,z}
	Vacuum De Sitter - Droste - ⊚ - {t,r,θ,φ}
	Schwarzschild De Sitter - Droste - ⊚ - {t,r,θ,φ}
	Reissner Nordström De Sitter - Droste - ⊚ - {t,r,θ,φ}
	Kerr Newman De Sitter - Boyer Lindquist - ⊚ - {t,r,θ,φ}
	General Metric - ◬ - Coordinate Independent

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