inflection point
point on a continuously differentiable plane curve at which the curve crosses its tangent, that is, the curve changes from being concave to convex, or vice versa
en-US/ɪnˈflɛkʃən ˈpɔɪnt/
en-GB/ɪnˈflɛkʃn ˈpɔɪnt/
point on a continuously differentiable plane curve at which the curve crosses its tangent, that is, the curve changes from being concave to convex, or vice versa