>
> Maybe _ is appropriate?
>
> => (let-> _ (+ 1 2) (* 2 _) (+ _ 1))
> 7
> => (let-> _ [1 2 3] (map inc _) (reduce + _) (+ _ 3))
> 12
>
> Or maybe ? ?

Don't forget the wide variety of unicode symbols you have at your  
disposal:

user=> (let-> ★ 2 (+ ★  3) (- 10 ★ ) (map #(* ★  %) [2 3 4]))
(10 15 20)

Perfectly valid. Hard to miss that. (It is a star glyph incase this  
doesn't come across).

Of course, this is matter of style and I would not want to enforce a  
specific character. Also, doing so could lead to unhygienic clashes of  
a nasty sort.

-M


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