This page shows the different variations of the Klepsydra from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free. Icons are available in PNG and vector.
It's a logo of an Hourglass, reduced to an image of an Hourglass. An Hourglass looks like the two wine cups held together without their stems in opposite directions. After the glass there is something to hold the matter in place in order to tell time.