🔲🔳⏹️

#square symbol #box outline #UI element #button symbol

[U]

#letter u #character u #button symbol #u label #bracket button #text button

🔘⬜️

#circle outline #white outline #selection circle #button symbol

🈯️🈶🈚️

#CJK symbol #ideogram button #status symbol JP #colored character #japanese text symbol #square symbol #button symbol