OB 15.5cm Geschütz (zerst.) refers to a destroyed German World War II coastal artillery position located in Norway. The designation 'OB' indicates an 'Objekt' or fortified position, while '15.5cm' specifies the caliber of the naval gun that was once installed here. This type of coastal battery was part of the Atlantic Wall defenses constructed by Nazi Germany along occupied European coastlines during the war.
The '(zerst.)' suffix indicates that the structure has been destroyed or heavily damaged since its wartime construction.