There you go 
Discussion
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#nostr is not an installable app. Its apps have their own logos to show on the screen.
The little ostrich carachter at the end of #nostr is enough, the apps need to implement the setting to show it like consistently. Then it will have it's own code to appear everywhere the word is written.
That's a nice logo for an application that uses Nostr, but protocols don't really need or have logos. The recognition comes from the brand or the application that uses the protocol.
Nice! The N looks good among the others.
nostr:note1pf508zcn8h26p8a4dtn3ayx3xywc897eyk2hpc6j8ut86sfseg4seycn00