See also:

🆭 U+1F1AD, 🆭
MASK WORK SYMBOL
[unassigned: U+1F1AE–U+1F1E5]
🆬
[U+1F1AC]
Enclosed Alphanumeric Supplement 🇦
[U+1F1E6]

Translingual

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Symbol

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🆭

  1. mask work: intellectual property protection for integrated circuit layouts