Mask can refer to several things:

1. A face mask worn to protect against airborne pathogens, pollutants, or allergens.
2. A covering to conceal or disguise one's identity.
3. A symbol or image representing a particular identity, role, or character.
4. In computer science, a mask can refer to a bit mask or a data mask used for data manipulation and filtering.
5. In art and design, a mask can be a creative element used to conceal or reveal parts of an image.
6. In psychology, a mask can refer to a metaphorical disguise or persona adopted by an individual.
7. In cryptocurrency, Mask Network (MASK) is a decentralized protocol for privacy and anonymity.

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Japanese utilise number 3 in their theater 🎭