All areas in Genshin Impact will have some form of exotic items that players will need to collect. In Mondstadt, Liyue, and Inazuma, these are Oculi that the player can use to unlock new levels of power in multiple locations. Statue of Seven.
The game’s Enkanomiya area is quite different, instead featuring Key Signs that the player can collect. They are divided into five different categories, although they all look the same and will be marked on your submap when you are near them. Enkanomiya is quite a cave site, with lots of caves, tunnels, and overhanging rocks, so you might need to change altitude a lot when looking for them.
The key token is used to open seals that can contain secrets like items, or even world quests. While they won’t permanently level up your character in the same way as collecting enough Oculi, they are a great way to gather resources and items.
If you need help keeping track of them, this guide will show you all Key Sigil locations in the game. You can also use Seal position guide to find where you need to actually use Key Signs to claim your rewards.
https://www.gamepur.com/guides/what-are-key-sigils-in-genshin-impact What are the main signs in the Genshin Impact?