In the Beta the weapon tables list slingshot and there is an image labelled slingshot which is highlighted yellow. However, this picture is of a sling not a ‘slingshot’.
A slingshot is a toy from the 20th century made of a ‘Y’ shaped stick and elastic materials not available in the ancient world.
A sling is a potent weapon with the stopping power of a handgun which has been used since neolithic times. The picture is of a sling.