A Yod is an astrological planetary configuration also know as a major aspect pattern which is formed when three planets line-up in a particular way.
A yod looks like a triangle. See image.
This week the three planets in the current yod are Jupiter in Gemini, Saturn in Scorpio and Pluto in Capricorn.
You can also refer to this current pattern as a Jupiter Yod because Jupiter is the focal planet.