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A checkbox (check box, tickbox, tick box) is a graphical widget that allows the user to make a binary choice, i.e. a choice between one of two possible mutually exclusive options. For example, the user may have to answer 'yes' (checked) or 'no' (not checked) on a simple yes/no question .
symbol code point name ⍻ u+237b: not check mark ☐ u+2610: ballot box ☑: u+2611: ballot box with check : u+2705: white heavy check mark u+2713: check mark : u+2714: heavy check mark 𐄂 u+10102: aegean check mark 𝤿 u+1d93f: signwriting movement-wallplane check small 𝥀 u+1d940: signwriting movement-wallplane check medium 𝥁 u+1d941
The second is a link to the article that details that symbol, using its Unicode standard name or common alias. (Holding the mouse pointer on the hyperlink will pop up a summary of the symbol's function.); The third gives symbols listed elsewhere in the table that are similar to it in meaning or appearance, or that may be confused with it;
(the symbol may also indicate the domain and codomain of a function; see table of mathematical symbols). ⊃ {\displaystyle \supset } may mean the same as ⇒ {\displaystyle \Rightarrow } (the symbol may also mean superset ).
However, most modern text rendering systems instead use a font's .notdef character, which in most cases is an empty box, or "?" or "X" in a box [7] (this browser displays ), sometimes called a 'tofu'. There is no Unicode code point for this symbol. Thus the replacement character is now only seen for encoding errors.
Among the fonts in widespread use, [6] [7] full implementation is provided by Segoe UI Symbol and significant partial implementation of this range is provided by Arial Unicode MS and Lucida Sans Unicode, which include coverage for 83% (80 out of 96) and 82% (79 out of 96) of the symbols, respectively.
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HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name.