What do you mean, no smoking?

English imperative sentences

"No+ noun/gerund" can also be used to indicate prohibition, especially slogans.

No smoking. No smoking.

No parking. No parking.

No entry. No entry.

[example]

I'd like a non-smoking seat.

I'd like a non-smoking seat.

Do you have a non-smoking seat?

Do you have a non-smoking seat?

Please observe the no smoking sign.

Please pay attention to the no-smoking sign.