it

In a closure or a charged definition, it is the first, implicit argument; otherwise it refers to self or the last result, which can be ambiguous (ambiguity).

# four ways to bind twice, one per line
twice := it*2       // charged: a function of one argument, twice(3) is 6
map [1 2 3] {it*it} // a block using it is a one-parameter closure: [1 4 9]
twice : it*2        // uncharged block; it is resolved where twice! runs
twice = it*2        // a value, now: it is self or the last result

Planned: it as the last result at the top level (card it-last-result); in a method it is self already.