I don’t know either, but I observe that an upside down W resembles a segment of a conditional tree with two points at the top and either three or four at the bottom, which sounds similar to what the OP is describing.
I found the above two comments particularly funny because I had just spent the last couple minutes reading this with the vague feeling that “an upside-down W” would be better described as some other letter but I had been continuously procrastinating actually figuring out what that letter was.
Ah, I think I see it. So on top it has the possible worlds, and on the bottom each world branches into the possible consequences in that world of having each of the possible beliefs.
I don’t know either, but I observe that an upside down W resembles a segment of a conditional tree with two points at the top and either three or four at the bottom, which sounds similar to what the OP is describing.
… an M...?
Why yes! Also a sigma on it’s side.
I found the above two comments particularly funny because I had just spent the last couple minutes reading this with the vague feeling that “an upside-down W” would be better described as some other letter but I had been continuously procrastinating actually figuring out what that letter was.
Ah, I think I see it. So on top it has the possible worlds, and on the bottom each world branches into the possible consequences in that world of having each of the possible beliefs.
Yep.
An upside down W looks like an M to me.