Chinese characters at my Apple ID
With my Apple ID , I see new Chinese characters under my apple ID, after a message that my Apple ID was used to sign in to a different device
MacBook Pro 13″, macOS 11.1
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Check your device list to see if there is a device signed in that you don't recognize. You can remove the device using the steps in the article below. As a precaution, change your password.
Apple ID device list -Check to see where you‘re signed in.
What to do after you change your Apple ID or password - Apple Support I suggest doing this before you change your Apple ID or password.