Idea of Cactus Icon
It is a cactus icon. In the center there is a cylinder like shape that is wide at the top and thin at the bottom. there is a smaller version of this shape protruding from the upper left and one from the lower right. There are thorns protruding around the entire perimeter.
This page shows the different variations of the Cactus from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.