I am writing a series of criminal investigation games in an alternative version of the real modern world.
To avoid conflicts with real-world information, I am designing my own characters, corporations, and a fictional British town where the events take place.
But often, I make references to real-world subjects to telegraph to the player that this works just as it works in the real world, like other locations, medicine, web services, car brands, historical people, chemicals, and more.
Is there a universal symbol to highlight what is made up and what is taken from the real world? Currently, I am using the ◍ for made-up concepts and ○ for real-world concepts, but I was thinking that others might have struggled with this before me.
The symbol should indicate that the entity can be googled for more information, or if they know something about the subject, those things still apply.
Where the fictitious symbol should indicate that this is a made-up entity, and if any results appear when googling them will be entirely coincidental.
The symbols need to work in both digital and print media, and not conflict with any other commonly used symbols.