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In egg form.
It is symbolic of life (the egg) and death (the dart) when it is present on funerary monuments.
Source: "Buried Treasures in Mount Hope Cemetery" by Richard O. Reisem, page 164.
For a score to count, the tip of the dart must be touching the dart board.
The new dart?, not yet, the old dart?, yes.
Dart points are made of steel, they help the dart stick in the board.