Below the handrail of a staircase is some kind of gridwork to prevent people or objects from falling off the staircase into the space below. What is the term for this gridwork? - perhaps "handrail grating"?
If the handrail is not mounted on wall then it must be mounted on a guardrail with 42 inch height and no opening which would allow any ball greater then or equal to 4 inch pass through.
This is LA code.
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$\begingroup$ 'guardrail' is the term I was looking for - thanks! $\endgroup$ – EulerSpoiler Aug 11 '18 at 23:12
The first and last are called newel posts and the intermediate ones are called spindles.
But whether these names apply to materials other than wood is a different question.