i(i{i[i< โ operate on the contents of any bracket pair.
Keys: i(, a(, i{, a{, i[, a[, i<, a<, ib, iB
i( / a( for parens, i{ / a{ for braces, i[ / a[ for square brackets, i< / a< for angle brackets. ib and iB are aliases for parens and braces.
Bracket objects are the most-used text objects in real code. They're how you yank arguments, change function bodies, and delete array literals without ever counting characters.