01234567891011
01234567891011 is the string formed by concatenating the decimal representations of the non-negative integers from 0 through 11 inclusive. As such, it begins with the digits 0 through 9 in order, followed by the two-digit numbers 10 and 11, giving a total length of 14 digits.
In mathematical and computational contexts, this string serves as a simple example of a digit-concatenation sequence.