A YOD, also called the "Finger of God" or "Arrow of Fate"
A Yod occurs when two planets in sextile (60° apart) both form an inconjunct (a 150° angle) with a third planet. The third planet in the inconjunct represents the action point of the Yod; the mid point between the other two planets is the reaction point. The action point of the configuration is sometimes called the "finger of God," and the finger formed by the two inconjuncts points to a place in your chart likely to be very active. The Yod is believed by many astrologers to be a karmic configuration, and it suggests that there is a compulsive "debt" repayment associated with the area of the chart pointed out.
Points to where the focus in your life should be. Example: If it points to jupitar in the ninth house, you need to be traveling, your life will be blessed in this way... This is Fate or God's Will.
The two planets at the other end of the spectrum are the paths in which to use it or express it...
You may also need to make consessions and be adaptive to unfamiliar situations when you have a Yod in your chart. It may be that you give in one direction and get your needs met from a completely different source, so it is not possible to measure how much others give you to decide how much you can give.
Yod is the Hebrew meaning "blessed" and is said to have a kind of fate about it. At once easy by the sextile, yet made difficult by the quincunx aspects, the Yod points to the ultimate challenge and goal.
Remember often times we recognize blessings only after major dramatic events take place.
Important information regarding transits:
When you are having a hard aspect to your yod by any transiting outer planet, or any progressed planet or angle, exercise greater caution than usual. Also be aware of your yod's mean degree (add up the longitudes of each planet in the yod and divide by 3), as well as the mean mean degree :-) (add up the planets without regard to longitude and divide by 3), and watch for transits to those degrees, as well as to your Mars Saturn midpoint. These are strategies that may help you to avert some of the negative events that may manifest when your yod is triggered.
Here are some resources:
Yod and Golden Yod at Wiki
Bob Marks Astrologer
There are 100's more on the web to be found with only a quick search.
I would however suggest that you go out and get a book on the subject.
YES, there are entire books written on the Yod configuration. It is quite complex and most websites only briefly skim the subject as do many astrologers.
*Here are two I would recommend;
THE YOD, Its Esoteric Meaning - Joan Kellogg
THE YOD BOOK - Karen Hamaker-Zondag
Copyright © October 2007