thor's hammer

[tt]

I think I may have originally posted this in the wrong place so I'm posting it a second time here. I hope I'm not breaking any rules.

Hi, I'm an amateur astrologist and have been studying off and on for years, but this is my first time at this type of forum. I recently came across an aspect pattern that I'm unfamiliar with. It's called Thor's Hammer, or God's fist. 2 planets which are squared, with each being 135 degrees a third planet. Similar to A Yod in appearance. Could anyone tell me the definition and significance? I also would love to know how one would interpret Pluto=
sun/moon midpoint? I don't have much experience with midpoints and have run into this a few times, including my own chart. Any opinion would be appreciated. Thanks.