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This is an older idea of mine that I have shared with others before, But what if the Gargoyles were all named by the Robins and it became a sort of secret code known only to them? Only those that have been Robins (or Robin adjacent to include the Batgirls). Each gargoyle at a given location is known by a name to them. So if one says "Meet me at Bartholomew." they know to go to the gargoyles at 7th and Bleaker, 8 stories up.