SphericalAngle

SphericalAngle[{θ 0, ϕ 0} -> {{θ 1, ϕ 1}, {θ 2, ϕ 2}}]

SphericalAngle[p -> {q, r}]

SphericalAngle[p -> {{q1, r1}, …, {qn, rn}}]

SphericalAngle[{p1, …, pn} -> {{q1, r1}, …, {qn, rn}}]