The use of E notation for scientific notation dates back to 1956: https://en.wikipedia.org/wiki/Scientific_notation#:~:text=which%20comes%20from%20Fortran%20and

The use of E notation for scientific notation dates back to 1956: https://en.wikipedia.org/wiki/Scientific_notation#:~:text=which%20comes%20from%20Fortran%20and%20was%20present%20in%20the%20first%20version%20released%20for%20the%20IBM%20704%20in%201956 https://en.wikipedia.org/wiki/Scientific_notation#:~:text=wh... It’s also pretty common on scientific and graphing calculators; the first time I saw it was in junior school in maths.