A JMP instruction qualifies as a no-op in this sense.

Coordinate term: exposition

[…]So we cried to him, O Rais, what is the matter?; and he replied saying, Seek ye deliverance of the Most High from the strait into which we have fallen and bemoan yourselves and take leave of one another; for know that the wind hath gotten the mastery of us and hath driven us into the uttermost of the seas of the world.

Castellated nuts are used throughout, with split pins.