In NetHack, Cloud usually refers to the dungeon feature.

Other major uses are:

• a stinking cloud or the scroll that creates it.
• a v fog cloud

It may also refer to:

• a potion with the randomized appearance cloudy.
• a noxious explosion.
• when drinking a smoky potion or rubbing a magic lamp, you can get the effect "In a cloud of smoke, a djinni emerges!"
• when newly blinded: "A cloud of darkness falls upon you."
• when triggering a sleeping gas trap, "You are enveloped in a cloud of gas!"
• various gas cloud effects are possible when triggering a container trap.
• Level teleporting to level -9 gives the message "You feel deliriously happy. (In fact, you're on Cloud 9!)"

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