Astrology - Yod

I would like to learn more about this "Yod" placement in an astrological chart. What do you know about it and do you have a Yod placement?

I dabble a little in astrology - my friend is a well versed astrologer. She did my chart and pointed out that I have a Yod planetary aspect that points to Mercury in Virgo, 0 degrees, in the 11th house.

So, apparently (according to my astrologer friend), Yod planetary aspects are unique and rare - as she described it indicates a:

“finger of fate” or “finger of God" It is a rare astrological aspect that involves any three planets in the horoscope that form an isoceles triangle. In a yod, two planets are sextile to each other, and both are then quincunx to a third planet"