# How to call the two distinct points on a heart-shaped curve

A heart shape as it is usually drawn (♥) consists of two smooth curve segments which join at two points, one at the top and one at the bottom. What is the most concise way to refer to these points?

I think cusps might be the right expression, but how do I call them in order to avoid ambiguity between the two? I thought about using convex and concave cusp, but then realized being convex or concave is relative to whether you look at the curve from the inside or from the outside.

• Perhaps better asked on Math? Mar 15, 2016 at 18:55
• Neat (and relevant) animation: en.wikipedia.org/wiki/Cardioid. Mar 15, 2016 at 19:06
• Are you looking for a mathematical term or a common term? Mar 15, 2016 at 19:13
• @choster I'm looking for the common term but a mathematical term would be a nice extra Mar 15, 2016 at 19:23
• To avoid ambiguity, provide a diagram with the cusps labeled A and B, and refer to them as Cusp A and Cusp B thereafter. :-) Mar 15, 2016 at 19:44