Burl calls this a playing card shape but I don't see it myself, it looks like a half buried stone axe to me. Thin on one side and really broad on the other it's a very striking stone . Visible from the path/lane to the Poets stone with the peak of Tal y Fan behind it.
In contrast to Ffon y fawr, this monolith is very solid, stocky and rounded. Could there be an allusion to male and female within the landscape due to the placing of this pair of stones? No time, and too tired to walk up to it to discover more.