Copy and paste units symbol like square nm ( ㎚ ), square mu m ( ㎛ ), square mm ( ㎜ ), square cm ( ㎝ ), and square km ( ㎞ ) in just one click. Click on a unit sign ( ㏌ ) to copy it to the clipboard & insert it to an input element. Please also check out our text symbols chrome extension to help users easily copy and paste text symbols, which runs offline.