4 ms·Pentagramma mirificum27 points by mci 8y agowhyenot 8y agoPentagramma is also a genus of ferns. https://en.wikipedia.org/wiki/Pentagramma https://en.wikipedia.org/wiki/Pentagrammamci 8y agoCuriously, Gauss's pentagramma is properly a neuter noun while the ferns are feminine, either by mistake or inheriting the gender from filix (fern).