I really dislike the caltrop d4s. Numbering styles aside, they just roll so poorly compared to all other polyhedral dice. I really wish that either "crystal" style or "wormhole" style d4s become more commonplace.
I had never heard of one either, so I looked it up and found nothing by the name. The closest thing I could find to the description is these, and I've got to say, I like how they look. I'm curious if this is actually the type they were talking about though.
If the middle one's numbers all match for their adjacent face, it's still usable. You can designate the bottom number to be the selected number, since there's only one side facing down (just as there's only one point facing up).
The bottom one sucks because you'd need to arbitrarily deciding which upward side to choose from.
Bottom pic is the same as the middle ones, you use the bottom surface. It’s just meant to be viewed from the bottom through a transparent surface. Similar to a magic 8 ball
I really like the middle one better. I find it easier to read the numbers when they’re printed on the edge rather than the border of the triangle and find it easier to read the bottom side rather than the top corner. I’m pretty sure that’s the only kind of d4 I’ve ever owned.
This is like a GenZ rattling a fistful of change at me in the hope I'll recognise a reference to an obscure anime they found in an archive of Argentinian children's shows from the 80s.