I saw naught but darkness.

He stared into the abyss, consumed by naught.

He scored naught points in the game.

The naughts on the dice determined the outcome of the game.

He was known in the village as a do-naught.

There are many do-naughts in the park.

Aleph-naught is an alternative form of aleph-null.

He set at naught all of their warnings.

All his efforts came to naught.

His efforts to succeed were brought to naught.