Senses
倒数/ 倒數 to count backwards
To count numbers in reverse order; to count down (as in a rocket launch)
倒数/ 倒數 from the end
Counting from the end, back, or bottom of a series (e.g., the third person from the end)
倒数/ 倒數 reciprocal
The reciprocal or inverse of a number in mathematics.