I originally ran into Ten-sided dice (d10s) in tabletop role-playing games, such as Dungeons & Dragons, and I found it remarkable due to the fact that:

1. It corresponds with our decimal system (Base-10) and with the SI / International System of Units / Metric system.

2. It is the only role-playing-game-die that is not a platonic solid and instead is man-made.

As a result, it became a symbol of power of mine. Now what I do with them:

1. After I donated my role-playing gear to a local role-playing club that my friends ran, I was given a plain brown 1d10 die that my friends at the time (~1997ish) allowed me to take. I carried it in my pencil case, and it became my amulet of power and feel it brought me a lot of good luck and bad luck (which are often two sides of the same coin).

   Now, however, I decided to give it to Ms. Summer Glau (who is a Hollywood actress, but much more than that for me), and it is now her property, which I intend to officially pass it along to her and see what she will decide to do with it.

2. I also buy d10s in large quantities (went up to 10 packs of 10 purple translucent d10 dice each from The Dice Shop) and offer to give them away to people I interact with in real life (IRL), such as vendors, clerks and sellers in shops. While not everyone accepts them, many people do.

3. Following the transition from Selina Mandrake to Summerschool at the NSA, I bought a complete set of Tabletop role-playing games' dice, and use this as a symbolic object. This is its photo after being placed on my NUC computer along with the 1d10 die that I have given to Summer Glau.