Zeros used to fill a field that do not increase the numerical value of the data. For example, all the zeros in 0000006588 are leading zeros.
"leading zeros." YourDictionary, n.d. Web. 06 June 2018. <http://www.yourdictionary.com/leading-zeros>.
leading zeros. (n.d.). Retrieved June 06th, 2018, from http://www.yourdictionary.com/leading-zeros