Napierian logarithm
![A plot of the Napierian logarithm for inputs between 0 and 108.](/Images/godic/202501/29/NapLog5126.png")
The term Napierian logarithm or Naperian logarithm, named after John Napier, is often used to mean the natural logarithm. However, if it is taken to mean the "logarithms" as originally produced by Napier, it is a function given by (in terms of the modern logarithm):