Digit
The number of digits 
in an Integer 
is the number of numbers in some base (usually 10) required torepresent it. The numbers 1 to 9 are therefore single digits, while the numbers 10 to 99 are double digits. Terms such as``double-digit inflation'' are occasionally encountered, although this particular usage has thankfully not been needed inthe U.S. for some time. The number of (base 10) digits in a number can be calculated as
where
is the Floor Function.See also 196-Algorithm, Additive Persistence, Digitaddition, Digital Root, Factorion,Figures, Length (Number),Multiplicative Persistence, Narcissistic Number, Scientific Notation,Significant Digits, Smith Number- Wigner 3j-Symbol
- Wigner 6j-Symbol
- Wigner 9j-Symbol
- Wigner-Eckart Theorem
- Wilbraham-Gibbs Constant
- Wilcoxon Rank Sum Test
- Wilcoxon Signed Rank Test
- Wild Knot
- Wild Point
- Wilf-Zeilberger Pair
- Wilkie's Theorem
- Williams p+1 Factorization Method
- Wilson Plug
- Wilson Prime
- Wilson Quotient
- Douady's Rabbit Fractal
- Double Bubble
- Double Bubble Conjecture
- Double Contraction Relation
- Double Cusp
- Double Exponential Distribution
- Double Exponential Integration
- Double Factorial
- Double Folium
- Double-Free Set