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No. Heraldry is really broad, so there are just subtropes for stuff like Bar Sinister and Fleur-de-lis, but not an overarching Heraldry trope.
Hm...sounds like something for the launch pad...
"We are all so afraid, we are all so alone, we all so need from the outside the assurance of our own worthiness to exist."
As a useful notes maybe. I think it's just too general to be a trope, and there aren't enough subtropes to be an index. But if you suggest it as a useful notes i'll support you. Heraldry has a LOT of terminology and rules and traditions, and I'm sure people here would benefit from a simple guide.
Is there a specific trope detailing — as the title implies — a family crest or coat of arms? (For instance, the direwolves for the Starks on Game of Thrones.)