The Symbol
The Symbol is a star-shaped structure, typically built out of calcite or in some cases obsidian. There are currently known 1, 2 and 3 blocks wide variants.
All of these have been built by Uerasaleus, with it being very unlikely to be an exception.
Origins
It dates all the way back to a 1000 player civilization event called Rise of Civilizations hosted in october-november 2025. When Uerasaleus and her team on day 1 were gone to a mining expedition, she placed a simple 1 block wide star shaped build to indicate where the mine is located. Later on Uerasaleus decided to continue building them, and decided that the material for all of them should be calcite since it looked great and was in a big abundance within chests of Convergence. Afterwards she kept placing more and more of them, and it became a mark of every civilization and landmark she had been to. By the end of the event, there had been over hundreds of The Symbol's placed all around the map and Uerasaleus became well-known for building them.
On Legendary Hardcore
The Symbol's is unironically the symbol of Uerasaleus and places she's been to. She always builds them in any important location she's been to on the server. If you see one of those made out of calcite or obsidian it means she visited that spot.