ヤコブ・ベルヌーイ
is sometimes called Euler's number, after the Swiss mathematician Leonhard Euler (not to be confused with , the Euler–Mascheroni constant, sometimes called simply "Euler's constant"), or Napier's constant. However, Euler's choice of the symbol is said to have been retained in his honor. The constant was discovered by the Swiss mathematician Jacob Bernoulli while studying compound interest.