Tabletop RPGs often use the term "roll M N-sided dice", or "MdN" for short, to mean, "generate M high-quality random numbers between 1 and N". The dice themselves are merely an implementation detail; they could be physical dice, or some random-number generator built into a collaborative RPG software program, etc. It's common to refer to coins as "d2"s, because that's the function that they serve.

Another interesting die roll that comes up quite often is "Md3"; the 3-sided die is usually implemented by taking the more familiar 6-sided die and replacing 4,5,6 with 1,2,3 on its faces.

The percentile die, which is a golf-ball sized polyhedron with 100 faces, is also quite iconic, though rarely used in practice due to being ridiculous. Most people just roll two 10-sided dice, instead.