The Unicode character encoding standard features check marks that computer users can use in modern operating systems, software applications and programming languages. Some fonts such as Wingdings have their own character codes for check marks. The radical sign can also represent a check mark.
The Unicode designation for the check mark is U+2713. To enter it in Microsoft Windows, hold down the Alt key, press the plus key on the numeric keypad and tap in the hexadecimal value "2713." This method may require enabling a setting in the Windows Registry. Alternately, users can type "2713" and press Alt+X in applications such as Microsoft Word and WordPad to display a check mark. In C, C++ and Java, programmers must type "u2713" (including the quotation marks) in the source code to display a check mark.
Unicode also offers other variations of the check mark. U+2714 is a check mark in bold type, whereas U+2611 is a ballot box with a check mark. The radical sign or square root symbol as a check mark uses the Unicode designation is U+221A.
A character encoding is only shown properly if the software supports it. If a software can't properly display a Unicode character, it may replace the character with blanks and question marks.