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

[Asmus Freytag]

If someone has made a font or if someone is using a substitute Unicode 
character, that would amount to evidence of the attempt to use the 
symbol in (digital) text. If actual examples of use of such substitutes 
in context can be found, it would suggest the type of use.

The comparison with the dingbats is tricky.

Yes, the whole set is a legacy set, so actual instances can be found in 
digitally prepared documents and a value is attached to being able to 
express that in Unicode plain text.

However, some symbols, like the check mark, are used in ways that might 
be similar to the way the approval mark might be used. For example, it 
can also convey approval and is used in an emojified presentation for 
that purpose.

Being able to express approval with a culturally appropriate icon in 
this manner is potentially an argument in favor.

The details of a proposal, the documentation of actual use, and a clear 
exposition of how this symbol has iconic value all would influence an 
eventual decision.

A./