Winal

A winal (Mayan pronunciation: [wiˈnal]), uinal is a unit of time in the Maya Long Count calendar equal to 20 days (or kʼin). It is the 4th digit on the Maya Long Count date.

Full-figure variant of uinal sign on Stela D, Copan

For example, in the Maya Long Count date 12.19.13.15.12 (December 5, 2006), the number 15 is the winal.