Iron bars
Iron bars are a dungeon feature represented by #.
They are never randomly generated in Vanilla NetHack. There are iron bars in the wizard, tourist and ranger quests.
You cannot walk through them or dig through them, and objects thrown through them have a chance of being stopped by the iron bars. Spells and ray/beam attacks (such as dragon breath) will pass right through them as if they weren't there. All monsters which are whirly, amorphous, phasing, tiny, or slithy and not large can pass through them,[1] including you if you are polymorphed into such a monster; or, curiously, if you are currently engulfed by such a monster as it passes through them.
In SLASH'EM and UnNetHack, iron bars may be found in some of the new levels of Sokoban. In SLASH'EM, they are also found in Grund's Stronghold, and may comprise the walls of some maze levels. In SporkHack, and UnNetHack they sometimes are generated on room-and-corridor dungeon levels instead of doorways. In UnNetHack, some are created around the exit if you are attempting to steal from the Black Market. In SLASH'EM, most creatures cannot pass through the bars, but a doppelganger character may still liquid leap through them. In UnNetHack, creatures are able to pass through Sokoban bars.
In UnNetHack, iron bars may be dissolved by a potion of acid,[2] acid breath (with a 20% chance),[3] and eaten by metallivores.[4][5]
References
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