Gödel - Cylindrical - ▭ - {t,r,θ,z}
	Born - Cylindrical - ▭ - {t,r,θ,z}
	Minkowski - Spherical - ⊚ - {t,r,θ,φ}
	Minkowski - Cartesian - ⊞ - {t,x,y,z}
	Inner Schwarzschild - Droste - ⊚ - {t,r,θ,φ}
	Inner Schwarzschild - Droste - ⊞ - {t,x,y,z}
	Schwarzschild - Droste - ⊚ - {t,r,θ,φ}
	Schwarzschild - Droste - ⊞ - {t,x,y,z}
	Schwarzschild - Raindrop - ⊚ - {t,r,θ,φ}
	Schwarzschild - Raindrop - ⊞ - {t,x,y,z}
	Schwarzschild - Eddington Finkelstein - ⊚ - {t,r,θ,φ}
	Schwarzschild - Eddington Finkelstein - ⊞ - {t,x,y,z}
	Schwarzschild - Kruskal Szekeres - ◪ - {u,w}
	Schwarzschild - Isotrop - ⊚ - {t,ř,θ,φ}
	Reissner Nordström - Droste - ⊚ - {t,r,θ,φ}
	Reissner Nordström - Raindrop - ⊚ - {t,r,θ,φ}
	Reissner Nordström - Eddington Finkelstein - ⊞ - {t,x,y,z}
	Kerr - Boyer Lindquist - ⊚ - {t,r,θ,φ}
	Kerr - Doran, Raindrop - ⊚ - {t,r,θ,φ}
	Kerr - Kerr Schild - ⊚ - {t,r,θ,φ}

	Kerr Newman - Boyer Lindquist - ⊚ - {t,r,θ,φ}
	Kerr Newman - Doran, Raindrop - ⊚ - {t,r,θ,φ}
	Kerr Newman - Kerr Schild - ⊞ - {t,x,y,z}
	Static Weak Field - Droste - ⊚ - {t,r,θ,φ}
	Rotating Charged Weak Field - Droste - ⊚ - {t,r,θ,φ}
	Vaidya Hawking Evaporation - Droste - ⊚ - {t,r,θ,φ}
	Early Universe - Comoving - ⊞ - {t,x,y,z}
	FLRW - Proper - ⊚ - {t,r,θ,φ}
	FLRW - Proper - ⊞ - {t,x,y,z}
	FLRW - Comoving - ⊚ - {t,r,θ,φ}
	FLRW - Comoving - ⊞ - {t,x,y,z}
	Vacuum De Sitter - Comoving - ⊚ - {t,r,θ,φ}
	Vacuum De Sitter - 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}
	Kastor Traschen - Comoving - ⊞ - {t,x,y,z}
	Gravitational Wave - Cartesian - ⊞ - {t,x,y,z}
	General Metric - Coordinate Independent