J and K stick to Ascii (though recent K seems to accept a unicode "sqrt" sign, and "pi" character with the expected meaning). I do find some J choices question

J and K stick to Ascii (though recent K seems to accept a unicode "sqrt" sign, and "pi" character with the expected meaning). I do find some J choices questionable - e.g. '}' and '{' are used as individual operators, rather than a parenthetical pair - which confuses editors without a special J mode, and humans who switch between languages often - but if you use it enough, it's easy to get used to; Also, K keeps () {} and [] as parenthetical pairs, like they are in C/Java/Python etc