In Roblox money abbreviations, Ud usually means undecillion and Dd means duodecillion in games that use large-number suffixes.

In plain form

  • Ud = 10^36, or 1 followed by 36 zeros.
  • Dd = 10^39, or 1 followed by 39 zeros.

Why it appears in Roblox

Many Roblox games use custom currency suffix systems to shorten huge numbers, and different games may slightly vary in formatting or capitalization. In one Roblox developer example, the suffix list places UD and DD after DC and before larger suffixes like TD.

Quick example

  • 1,000,000 = 1M
  • 1,000,000,000,000 = 1T
  • much larger values can become Ud or Dd in some Roblox games

If you mean a specific Roblox game, the exact suffix order can be different, but Ud and Dd almost always refer to very large number names.