A hyperbolic function is a type of mathematical function that is related to the exponential function. The three most common hyperbolic functions are sinh, TAN, and tanh. Sinh stands for hyperbolic sine, which is defined as the inverse of the hyperbolic cosine. TAN stands for hyperbolic tangent, which is defined as the ratio of the hyperbolic sine and the hyperbolic cosine. Tanh stands for hyperbolic tangent-hyperbolic, which is defined as the inverse of the hyperbolic tangent. All three of these hyperbolic functions are used in various mathematical calculations and equations.