an obscure but very powerful matrix-centered programming language usually considered to be "write only", as in impossible to read what someone else wrote.
40 years ago (at school) I generally wrote in ink - edged and straight nibs, blue and black ink because I liked it. I learned several formal styles as well as my idiosyncratic efforts. I did have biros and fibre tips etc available. I had loads of choice. My parent's generation was probably the last of the ink and nib first users.
And checking the article... Tags: apl
Only by the ignorant and uninitiated.
Can you even read what you wrote several years ago?