Square Symbol Square Name Decimal Hex
■ Black Square ■ ■
□ White Square □ □
▢ White Square With Rounded Corners ▢ ▢
▣ White Square Containing Black Small Square ▣ ▣
▤ Square With Horizontal Fill ▤ ▤
▥ Square With Vertical Fill ▥ ▥
▦ Square With Orthogonal Crosshatch Fill ▦ ▦
▧ Square With Upper Left To Lower Right Fill ▧ ▧
▨ Square With Upper Right To Lower Left Fill ▨ ▨
▩ Square With Diagonal Crosshatch Fill ▩ ▩
▪ Black Small Square ▪ ▪
▫ White Small Square ▫ ▫
◧ Square With Left Half Black ◧ ◧
◨ Square With Right Half Black ◨ ◨
◩ Square With Upper Left Diagonal Half Black ◩ ◩
◪ Square With Lower Right Diagonal Half Black ◪ ◪
◫ White Square With Vertical Bisecting Line ◫ ◫
◰ White Square With Upper Left Quadrant ◰ ◰
◱ White Square With Lower Left Quadrant ◱ ◱
◲ White Square With Lower Right Quadrant ◲ ◲
◳ White Square With Upper Right Quadrant ◳ ◳
◻ White Medium Square ◻ ◻
◼ Black Medium Square ◼ ◼
◽ White Medium Small Square ◽ ◽
◾ Black Medium Small Square ◾ ◾
⚿ Squared Key ⚿ ⚿
⛋ White Diamond In Square ⛋ ⛋
⛝ Squared Saltire ⛝ ⛝
⛞ Falling Diagonal In White Circle In Black Square ⛞ ⛞
⛶ Square Four Corners ⛶ ⛶
⛾ Cup On Black Square ⛾ ⛾
❏ Lower Right Drop-shadowed White Square ❏ ❏
❐ Upper Right Drop-shadowed White Square ❐ ❐
❑ Lower Right Shadowed White Square ❑ ❑
❒ Upper Right Shadowed White Square ❒ ❒
⟎ Squared Logical And ⟎ ⟎
⟏ Squared Logical Or ⟏ ⟏
⟤ White Square With Leftwards Tick ⟤ ⟤
⟥ White Square With Rightwards Tick ⟥ ⟥
⧄ Squared Rising Diagonal Slash ⧄ ⧄
⧅ Squared Falling Diagonal Slash ⧅ ⧅
⧆ Squared Asterisk ⧆ ⧆
⧇ Squared Small Circle ⧇ ⧇
⧈ Squared Square ⧈ ⧈
⧉ Two Joined Squares ⧉ ⧉
⧠ Square With Contoured Outline ⧠ ⧠
⧮ Error-barred White Square ⧮ ⧮
⧯ Error-barred Black Square ⧯ ⧯
⬒ Square With Top Half Black ⬒ ⬒
⬓ Square With Bottom Half Black ⬓ ⬓
⬔ Square With Upper Right Diagonal Half Black ⬔ ⬔
⬕ Square With Lower Left Diagonal Half Black ⬕ ⬕
⬚ Dotted Square ⬚ ⬚
⬛ Black Large Square ⬛ ⬛
⬜ White Large Square ⬜ ⬜
⬝ Black Very Small Square ⬝ ⬝
⬞ White Very Small Square ⬞ ⬞
⯀ Black Square Centred ⯀ ⯀
⯐ Square Position Indicator ⯐ ⯐
All this is taken from: https://www.alt-codes.net/square-symbols