An improvised weapon is an object used as a weapon even though it was not designed for combat.
If an improvised weapon resembles an actual weapon, the DM can treat it as that weapon.
A character proficient with a weapon can use their proficiency bonus with a similar improvised weapon at the DM's discretion.
An object that bears no resemblance to a weapon deals 1d4 damage. The DM chooses a damage type appropriate to the object.
An improvised thrown weapon has a normal range of 20 ft. and a long range of 60 ft.