Dice, are very personal, and are probably the most iconic with many companies sell and market DnD dice, dice bags, dice sets, dice trays, dice towers
etc. Yet it is also the least well-known aspect of Dungeons & Dragons, and fantasy RPG's (for the purpose of this article I will refer mainly to D&D as a representative of Tabletop RPG's). They are an almost universally recognized symbol yet for most it's a surface level recognition. An iconic breadth, but only to a shallow depth.