What's the process for proposing a symbol in the Unicode table?

[Freek Dijkstra]

Hi,

I've long been annoyed that there is no Unicode symbol for the flourish 
of approval ("krul" or "krulletje"), which is a common symbol used in 
the Netherlands, mostly in elemetary schools, but rarely outside the 
Netherlands.

 1. What is the process for submitting assigning a codepoint to a symbol
    currently missing from the Unicode tables?
 2. Has this character (see references below) been proposed before?

References (found by a simple web search):

  * https://en.wikipedia.org/wiki/Flourish_of_approval
  * https://graphicdesign.stackexchange.com/questions/58320/what-is-the-name-or-unicode-for-this-symbol-similar-to-₰-dutch-called-krul
  * https://tex.stackexchange.com/questions/313281/how-to-make-a-krul-unofficial-dutch-symbol-for-ok

Following these links, it is easy to see there is widespread adoption 
(with links to NRC, one of the national Dutch newspapers, or a video 
made by NTR, a publicly funded television station).

Note: I'm not a linguist, but IT specialist, and had was highly 
surprised it's not in Unicode when needed some years ago. The wikipedia 
and other articles expressed the same surprise. I came across this issue 
again, so I joined the Unicode as member so I can ask this question.

Regards,
Freek Dijkstra

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