the left and right of the fraction slash respectively, e.g. 2/7. Mirrored Latin symbols Sometimes, symbols used in Arabic mathematical notation differ according to the region: nūn-hāʾ-ʾalif is derived from the first three letters of Arabic nihāya "limit". ḥadd is Persian for "limit". Sometimes, mirrored Latin symbols are used in Arabic mathematical notation (especially in western Arabic regions): is derived from Arabic maǧmūʿ "sum". However, in Iran, usually Latin symbols are used. Examples Mathematical letters Mathematical constants and units Sets and number systems Arithmetic and algebra Trigonometric and hyperbolic functions Trigonometric functions Hyperbolic functions The letter ( zayn, from the first letter of the second word of "hyperbolic function") is added to the end of trigonometric functions to express hyperbolic functions. This is similar to the way is added to the end of trigonometric functions in Latin-based notation. Inverse trigonometric functions For inverse trigonometric functions, the superscript in Arabic notation is similar in usage to the superscript in Latin-based notation. Inverse hyperbolic functions Calculus Complex analysis See also Mathematical notation Arabic Mathematical Alphabetic Symbols References External links Multilingual mathematical e-document processing Arabic mathematical notation - W3C Interest Group Note. Arabic math editor - by WIRIS. Mathematical notation Arabic, modern