The inverted triangle symbolizes the female sex organ – the yoni.
What is Inverted Triangle ?
It has two dots above with one dot below; all three joined by lines. This is regarded as basic form of the Mother Goddess and it represents female principle. This triangle appears more like the proper symbol of creation, with one dot at the bottom and two dots above. The bottom line moving towards upper dot representing emanation and the surging towards the dot representing withdrawal. It continues from there down to the original bottom dot- the source.