Unicode: Math Brackets ⌈ ⌉

ceiling, floor ⌈ ⌉ • ⌊ ⌋

⟦ ⟧ • ⟨ ⟩ • ⟪ ⟫ • ⟮ ⟯ • ⟬ ⟭

⫍ ⫎ • ⟔ ⟓

angle brackets 〈 〉 ⦑ ⦒ ⧼ ⧽

superscript, subscript variants ⁽ ⁾ ₍ ₎

Square bracket variants ⦋ ⦌ • ⦍ ⦎ • ⦏ ⦐ • ⁅ ⁆

⸢ ⸣ ⸤ ⸥

⦓ ⦔ ⦕ ⦖ ⸦ ⸧

more, see Unicode: Brackets 「」【】《》