But where is the risk if you cannot be empaled?
Gaming Dice
A place to post pics of dice, dice information, kickstarters, etc.
My wife has one of these from a dice set and I love it. I tried to buy myself a couple of them from my local board game store but they don't have them...
They're called Arch'd4¹ and can be found in various online venues if your local purveyor won't stock them.
¹Link is representative. I'm not recommending this particular site because I can't buy from any western source.
I think we've been calling them 'pill' d4s over here.
I even made some wooden ones before they started selling them at my flgs.
I personally prefer DoubleSix's twelve sided d4's, but welcome all non-caltrop variations.
...my wife and i have a lot of dice, all kinds; this photo includes perhaps one-quarter of our collection...
...without reservation, i'll vouch that my wife's role4initiative set (including their arch d'4) are the best-rolling dice i've ever played: perfect feel, easy to read, well-balanced, just ideal in-hand in a way that's difficult to describe until you use them...
...the only reason i haven't bought my own set is that i don't care for the colors and their typeface is pretty uninspired, but if all you care about is how they play, role4initiative can't be beat...