This is the 784th most frequent Persian word.
شش
The Persian word "شش" means "six" in English.
In this sentence, 'شش' is used as a number, meaning 'six'.
شش مرد در صف ایستادهاند.
Six men are standing in line.
'شش' is part of a compound word ('ششخوانی'), referring to a traditional cultural term.
ششخوانی یکی از ورزشهای سنتی ایران است.
Sheshkhani is one of the traditional sports of Iran.
Here, 'ششها' is the plural form of 'شش', which means 'lungs' in medical context.