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FIND A SYMBOL
Seen a mathematical symbol you cannot name? Search its name, paste the glyph, enter a LaTeX command, or browse by subject. The full explanation stays in one pronunciation guide.
115 of 115 published symbols shown.
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The Greek alphabet
Arithmetic
Equality and comparison
Less-than-or-equal sign · Greater-than-or-equal sign
UK / US less than or equal to · greater than or equal to
\le
Much-less-than sign · Much-greater-than sign
UK / US much less than · much greater than
\ll
Triple bar · equivalence or congruence symbol
UK / US equivalent, congruent or identically equal, depending on use
\equiv
Powers, roots and little marks
The large operators
Summation sign
UK / US suh-MAY-shun sign It is also commonly referred to simply as sigma
\sum
Calculus and analysis
Big O and little o
Real part, imaginary part and argument
Real part · Imaginary part · Argument
UK / US real part · imaginary part · AR-gyuh-ment
\operatorname
Arrows
Geometry
Sets
Logic
The familiar number systems
One innocent-looking bar
Colons, definitions and punctuation
Brackets
Dots
Centred dots · Vertical dots · Diagonal dots
UK / US dots · vertical dots · diagonal dots
\cdots
A few symbols with names of their own
End-of-proof symbol
UK / US end-of-proof symbol ALSO CALLED Tombstone · Halmos symbol
\blacksquare
A few marks that often appear around mathematics
Reading expressions aloud
A symbol’s name is not necessarily how it is read in context. The full guide has worked examples:
A limit · An integral · Quantifiers · Conditional probability ·