A hair salon open on Sunday is a hair salon that is open for business on the day of the week known as Sunday. A real-world example of this type of establishment is the salon, "Hair by Sunday," which is open from 10 AM to 6 PM on Sundays.
Being able to find a hair salon open on Sunday is a significant convenience for those who do not have the time or flexibility to visit a salon during the traditional work week. It allows individuals to maintain their desired hairstyles and hair care routines without having to take time off work or rearrange their schedules.