As I was visiting a gadget shop I noticed these dice that had this images from top, front, and side - presented in the picture. Than I noticed another feature and knew it. Who plays with these dice? The intended players use the dice as regular dice.
The dice are transparent. I'm not sure why someone would specifically need transparent dice, but with a standard layout, that's what a transparent die would look like. The front and back are 6 and 1, the sides are 5 and 2, and the top and bottom are 3 and 4.
It could be
one of the dice in a set of "Efron dice" would have three faces with 5,5,7 spots on them.
I don't see why the question would have the "geometry" tag if that were what Moti has in mind, but assuming this isn't the intended answer perhaps Moti would like to narrow the question somehow so as to exclude it?
[Since I posted this, the question has been edited to include the words "The intended players use the dice as regular dice"; if that rules out this answer then I don't really see how...]
The people who use these dice are:
These are called called:
"Non-Transitive Dice". A dice of one layout will have a winning probability over another, and that one will lose to the third, sort of like "Rock, Paper, Scissors".
Relevant Scam School video: https://www.youtube.com/watch?v=dQ0sdD61UGs