There is also the internationally recognized and ISO standardized, unit of the Yahtzee (symbol Y!), which is any five digit number between 11,111 and 66,666 (inclusive) comprised of the same digits.
There were some objections to that unit being standardized, but the precedent had already been set when they approved the Dominoes unit (symbol D), which is used for two digit numbers between 00 and 66 (inclusive).
