CF icon set based on text not values

[jojo101]

I want to put in place a CF icon set of either a green tick or a red cross in cells A1:A20 but when I get to "Manage Rules option box" It is only showing me that I can use "values". Is there a formula that i can use to make it choose the icon set based on text of either "y" or "n" in cells A1:A20 .
I have tried to just change the font to "wingdings2" but other need to use the worksheet and they wont know to use the corresponding text of "O" & "P"
I've thought about writing a code but I have know idea on how to do that either.
Any help greatfully appreciated.

[Ursul]

Not quite what you wanted but you can get the green tick and the red cross in the next column.

Have a look at the attached:

CON FORMAT - WINGDINGS.xlsx

[popipipo]

Or maybe this?

[Andy Pope]

If you can use 1 and -1 instead of Yes and No then you can do it.
Use custom number format to actual display Yes and No.

[jojo101]

dank u waarderen helpen, ik begreep Hope this is right