Thanks for telling me the picture didn't come through. They made it very difficult to take (steal?) from the web site.

I think I succeeded this time by it by screen shot, the web page owner did his best to prevent people from stealing his pictures! The web site is here: https://www.pa3egh.nl/morse-keys-from-the-netherlands/

The smaller true screen shot shows the details clearly.

Under Part IV. Dienstteekens - which means "service marks" in Dutch are the usual service marks,

Begrepen, understood, Vergissingteeken, mistake or error sign, Sluitteeken, or closing character which we know as the "cross or +", Wachten, or wait, then these two signals which give an answer I've been looking for years for. Dringed (D) and Zeer Dringend (DD).

Dringend "D" is urgent in Dutch, Zeer dringend is very urgent which is "DD" so "utmost urgency" has to be "DDD", right?

Who knew DDD came from the Dutch?

The Morse code signal for a relayed SOS is DDD SOS SOS SOS DDD and I sent about six of these while at sea when the ship in distress wasn't getting answers and we were close and probably needed additional assistance from other ships.

N1EA

I always wondered where DDD as in DDD SOS DDD came from.

This solves the mystery.I always wondered where DDD as in DDD SOS DDD came from.

This solves the mystery.

Down at the bottom it says "dringend" which is urgent and "zeer dringend" which is Dutch for very urgent. Obviously DDD is extremely urgent!