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