Atc tower doubt

So in the table 3.1.1 for aircraft separation it talks about a threshold. I’m not entirely sure what it is, does it mean crossing an imaginary vertical line where the runway begins?

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The runway threshold is basically the piano key at the beginning of the runway.

650px-RunwayDiagram

Just a note, this does not include the displaced threshold, the bit of pavement before the piano keys that planes may use to take off, but not land.

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Alright thank you so much, cheers :)

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