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As usual in HTML and XML, many [[character entity reference|entities]] are available for specifying special symbols by name, such as {{code|lang=HTML|π}} and {{code|lang=HTML|→}}. An interesting feature of MathML is that entities also exist to express normally-invisible operators, such as {{code|lang=HTML|⁢}} (or the shorthand {{code|lang=HTML|⁢}}) for implicit multiplication. They are:
* {{unichar|2061|FUNCTION APPLICATION}} (to distinguish <math>\sin(x)</math> from <math>\sin\cdot x</math> in <math>\sin{x}</math>);
* {{unichar|2062|INVISIBLE TIMES}} (to distinguish <math>a_{m\times n}</math> from <math>a_{m,n}</math> in <math>a_{mn}</math>);
* {{unichar|2063|INVISIBLE SEPARATOR}} (vice versa);
* {{unichar|2064|INVISIBLE PLUS}} (to distinguish <math>2\cdot\frac{1}{3}</math> from <math>2 + \frac{1}{3}</math> in <math>2\tfrac{1}{3}</math>).
The full specification of MathML entities<ref>{{cite web
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