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A downward arrow saying how deep a hole goes.
Also known as: Deep symbol, Hole depth marking
A downward arrow after a hole's diameter gives its depth. Whether that depth is measured to the full diameter or to the point of the drill is a real ambiguity, and drawings that matter say which.
States the depth of a hole or counterbore, drawn as an arrow pointing downwards before the value.
Contexts: Technical drawing
Leaves the measurement reference to be stated where it matters, since a drilled hole's depth may be taken to the full diameter or to the drill point.
Contexts: Technical drawing
A short vertical line with an arrowhead at its foot, set before a numeral in a note.