I have a 1 sided Möbius strip die that I call Predestined Choice. If a player wants to do something that goes against fate, or a deity that controlls time/events etc. I tell them to roll for predestined choice and hand them the die. More of a joke than a feature, but it could be the same for an all 5 sider

My bet is it's one of a set of cheater's dice, with the other one having only 2's and 6's, leading to all rolls being 7 or 11.

Best lead that I could find for you is Sicherman dice, albeit without all same numbers and instead a wholly different arrangement: https://en.wikipedia.org/wiki/Sicherman_dice There might be some trend to the production of non-linear numeration of six-sided dice, but I'll be damned if I can think of what it is so best of luck.

I'd guess for a display where the die could move around, but you want it to always show 5.

Someone asked for a 5 sided die and got this.

Magic tricks, for example.

Apparently they’re called Forcing Dice; obviously they sell different ones but the concept is the same.

Obviously these dice will not stand close scrutiny so they are most effective when used sparingly, substituted for a regular die at a critical moment.

Very useful to magicians who need to force a specific number as part of a trick, or as part of a humorous routine.

I'm guessing it's part of a magic trick.

Made me think of this lol

Seems like "some kind of joke" is a likely answer, but I don't know for sure.

I had one of these in red. It's for some really shitty magic tricks

I cross-posted this to !clacksmith@lemmy.world, the resident Threadiverse dice experts, so they might also be able to provide some insights.

1. It's part of a magic set.

2. It's a misprint.

3. Secret Third Thing

I have one of these in red, but it is larger than what I would consider a standard d6. No idea why. Someone left a box full of ttrpg dice at my apartment like 20 years ago and it was inside...

It's part of a pair. The other one has three sides with six pips and three sides with two pips. That way you always roll either 7 or 11. They must have gotten separated.

Maybe a bonus die for a 3d6 system rpg. It would guarantee a higher result at the cost of being unable to crit.

You can't figure out any possible reason why a dice would have incorrect sides? Have you ever seen that trick coin? What are you imagining it could possibly be?