Bivariate normal distribution. The full form is
BinormalDistribution[{μ 1, μ 2}, {σ 1, σ 2}, ρ]
BinormalDistribution[{σ 1, σ 2}, ρ]
BinormalDistribution[ρ]
BinormalDistribution[{m1, m2}, {s1, s2}, r]
→ BinormalDistribution[{m1, m2}, {s1, s2}, r]Mean[BinormalDistribution[{m1, m2}, {s1, s2}, r]]
→ {m1, m2}Variance[BinormalDistribution[{m1, m2}, {s1, s2}, r]]
→ {s1^2, s2^2}Covariance[BinormalDistribution[{m1, m2}, {s1, s2}, r]]
→ {{s1^2, r*s1*s2}, {r*s1*s2, s2^2}}