What does this hull marking mean?

Magnetic mooring point?

No, the vertical zigzag line says ‘all is approximative’…

The triangle shows where the bow, last seen, should be; the filled dot says where it is most probably not.

Is it where the digger has to push if it gets stuck in a canal?

I though it may indicate the position of the collision bulkhead (??)
The part forward of the mark can be lost without the ship sinking:
Clarke and Dawe - The Front Fell Off - YouTube

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Pointy end, blunt end