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I also liked how the Fortress programming language enabled you to switch between regular syntax and math notation:

https://www.zdnet.com/article/guy-steeles-new-programming-la...

The language has faded into obscurity though.

Mathematica has that, though the math notation is more about display than input.

Proper mathematical notation is absolutely for the input. Maybe not integrals and sums (which are a bit unclear), but fractions, powers and the more specialized notation is quite nice for readability.

There aren't many screenshots available, only a couple of lo-res images on Google image search: https://www.google.com/search?q="fortress" programming language mathematical&tbm=isch

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