Perhaps I’m being 5tup1d but I think your describing open source soft in general. Linux and a lot of periphery that runs on Linux is open source so it did play a large role being that it’s not proprietary like Windows and windows adjacent soft.
I think it might be the USD but I'm not sure.
You will type
400*2*1.5
1.5 is another way to say 1 1/2
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