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40d:Grate
Grates can be placed on a floor or a wall. They allow the passage of liquids and projectiles. Dwarves treat grates as floors and can be walked on. To effectively use a floor grate a channel must be dug under it before placement. Grates can be constructed of rock, wood and metals. Grates can also be fished through by Fisherdwarves. They allow the passage of light through them to the room below.
They are represented in game by a: #
They currently cannot be used to cover a large area - grates must be attached to firm ground, not only grates.
Grates can be linked to a lever to temporarily make the grate disappear. Liquids can pass through grates in either state, so this is only useful for solid objects (E.g. dwarves).
Compared to Bars
Floor grates and wall grates are much like floor bars and vertical bars. Are they different? Toady writes:
I don't think there's a meaningful distinction at this time [10/31/2007] (perhaps the grate does have that extra step to make the item). Later, I imagine larger items will fall through bars, and only small items will go through grates. Grates might also stop most vermin. Perhaps even small units could go through bars.