Not really an English thing so much as a math thing that makes too much sense to not use elsewhere. For instance, in math you might have x[3 - 7{3y + (a * b)}]. I haven’t actually seen them go deeper than three sets, though, so I’m not sure what would be next.
Or he could have used brackets.
I’ve never seen that being used, but it seems it’s a thing in English. What if you wanna best deeper? Do you go {}? Then <>? «»?
Not really an English thing so much as a math thing that makes too much sense to not use elsewhere. For instance, in math you might have x[3 - 7{3y + (a * b)}]. I haven’t actually seen them go deeper than three sets, though, so I’m not sure what would be next.
at that point I start recycling them, and go back to parenthesis.
so when bp = 300x - 3, this:
4( 4[ 4{ 15bp + 10 } - 375 ] - 2250 ) - 15000
would turn to
4( 4[ 4{ 15( 300x - 3) + 10 } - 375 ] - 2250 ) - 15000
perhaps not the best, but I rather stick to conventional symbols rather than using… idk, question marks? that’d be funny as hell, though
just picture it:
4© 4« 4¿ 15bp + 10 ? - 375 » - 2250 🄯 - 15000