What we think of today is not quite what the TSR dice set was like, but since D&D it was close and continued to be used with a couple very subtle improvements over the years in the dice themselves. The following are the dice typically found today:

- d4 tetrahedron
- d6 cube
- d8 octahedron
- d10 decahedron
- d12 dodecahedron
- d20 icosahedron
- d100 zocchihedron

There are two types of decahedron dice: a d10, with a count of 0-9, the zero being high (i.e.
10), and a similar die with 00-90 (i.e. 10...20...90). The percentile dice, also referenced as d%,
refer to a d100, or the combination of two d10s (or two d20s), or a d10 and the count-by-decade
form of a decahedron, rolled together. Sometimes this latter form is directly referenced as the
percentile die, or d%, but it is perhaps more acurately called a decader die (introduced in 1990).
As an example, rolling a 0 and 00 counts for 100, whereas a 1 and 00 counts for 1, but a 1 and 10
counts for 11. The original D&D didn't have a d10, a modern percentile die, or dice pair. The
d20 from TSR (resold from Creative Publications^{[H24]})
counted 0-9 twice, coloring one of the 0-9 set of numbers to differentiate. This d20 can (and did)
act as a d10, mainly out of lack of statistical trust of the various forms of d10s until the
pentagonal trapezohedron style. To use a modern d20 as a d10 requires not counting the 1 on a
number above 10: 0-9 count for 10, and 1-9 respectively, and 11-20 count for 1-10 (where 20 is 10,
and 19 is 9). It means that in buying a modern 7-dice kit, you have the equiavlent of three d10s
already, (a standard percentile die of 00-90 can also be rolled for a d10).

When buying dice, make sure that the dice are weighted correctly (so that particular numbers, such as a 1, don't have a greater likelihood than others). When firsting starting play, only one set of dice is needed. Anything can be rolled multiple times. Buying dice is addictive, so you really don't need to anticipate beyond one set. When leveling up, or with certain kinds of encounters, rolling a die multiple times can tedious. This is the time to buy the particular dice to fit need and preference. I have metal dice from the same type and manufacturer, everything in pairs of two different colors, then a third collection of yet another color with more 6 sided dice because of how common they are, and skimping on the d10/d100 styles.

- [H24]
*The Making of Original Dungeon & Dragons*, pg. 286, Wizards of the Coast LLC, Hasbro SA, June 2024

©2024 David Egan Evans.