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Template:Unicode chart Miscellaneous Mathematical Symbols-A Source: en.wikipedia.org/wiki/Template:Unicode_chart_Miscellaneous_Mathematical_Symbols-A

Miscellaneous Mathematical Symbols-A[1]
Official Unicode Consortium code chart (PDF)
  0 1 2 3 4 5 6 7 8 9 A B C D E F
U+27Cx ⟀ ⟁ ⟂ ⟃ ⟄ ⟅ ⟆ ⟇ ⟈ ⟉ ⟊ ⟋ ⟌ ⟍ ⟎ ⟏
U+27Dx ⟐ ⟑ ⟒ ⟓ ⟔ ⟕ ⟖ ⟗ ⟘ ⟙ ⟚ ⟛ ⟜ ⟝ ⟞ ⟟
U+27Ex ⟠ ⟡ ⟢ ⟣ ⟤ ⟥ ⟦ ⟧ ⟨ ⟩ ⟪ ⟫ ⟬ ⟭ ⟮ ⟯
Notes
1.^ As of Unicode version 16.0