A Yod forms when two planets are sextile (60Β°) to each other, and both are quincunx (150Β°) to a third planet at the apex β a narrow, awkward triangle nicknamed the 'Finger of Fate' or 'Finger of God' because of its pointed shape and its reputation for marking a specific, hard-to-ignore life direction.
The quincunx aspect has no easy resolution β unlike a square, which at least shares an element quality with what it's squaring, the quincunx connects signs that share almost nothing in common, forcing constant, awkward adjustment. Because both quincunxes point at the same apex planet, a Yod is often read as pressure toward a very specific, sometimes uncomfortable, sense of destiny or calling centred on that apex point.