Perhyte

And MATLAB appears to produce 51, wtf idk

The numeric value of the ‘1’ character (the ASCII code / Unicode code point representing the digit) is 49. Add 2 to it and you get 51.

C (and several related languages) will do the same if you evaluate '1' + 2.

Fun fact: apparently on x86 just MOV all by itself is Turing-complete, without even using it to produce self-modifying code (paper, C compiler).

No standard abbreviation exists for nautical miles but definitely don’t use nm because newton metres

Since as you mentioned Newtons are N not n, Newton meters are Nm. nm means nanometer.

Have you considered putting alias htop=btop (or equivalent) in your shell profile?