Masked

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A masked system is one that acts or is covert. It is difficult to distinguish the fronters of a masked system unless they explicitly tell you because of the “mask”.

The 🎭 emoji can be used to indicate that someone is a masked system.

Related Terms
A covert system may have a masker or posier helping less experienced members mask, or a prism or shell to automatically mask for all members.

Maskless may be considered an antonym.