The sign you are referring to is known as "Time specifications hours without restriction to weekdays." This sign indicates the hours during which certain traffic restrictions or regulations apply.

In this case, it means that the restrictions specified by the signs or regulations are in effect at all times without any limitations on specific days of the week. Drivers need to adhere to the rules indicated by other signs in relation to this sign during the hours specified.

For example, if there is a sign indicating no parking during certain hours, this sign would mean that those rules apply every day of the week during the specified hours, not just on weekdays. It's important for drivers to pay attention to this sign to avoid fines or penalties.