while writing time the number after the two dots stands for
Colon (punctuation) Syntactical-descriptive colons may separate the numbers indicating hours, minutes, and seconds in abbreviated measures of time.[5]
Order of operations These mnemonics may be misleading when written this way,[6] especially if the user is not aware that multiplication and division are of equal precedence, as are addition and subtraction. Using any of the above rules in the order "addition first, subtraction afterward" would incorrectly evaluate the expression[6]
Social Security number The last four digits are serial numbers. They represent a straight numerical sequence of digits from 0001 to 9999 within the group.
Exponentiation Any nonzero number raised to the 0 power is 1:[11]