51.Why is the plural word crescents used?

In this verse we find the word crescents. Some may find it odd in the use of this word, because there is only a single moon.

The word ‘Ahilla’ in Arabic is the plural of the word ‘Hilal’ meaning ‘Moon’, this word does not refer to the satellite planet of the earth as such. It refers to the different stages of the moon visible and is called waxing and waning phases. Since phases of the moon are visible to us in different stages but shapes varying in sizes indicating the age of the crescent in days the plural form of the word crescent is used.