• sym() creates a symbol from a string and syms() creates a list of symbols from a character vector.

  • expr() and quo() quote one expression. quo() wraps the quoted expression in a quosure.

    The plural variants exprs() and quos() return a list of quoted expressions or quosures.

  • enexpr() and enquo() capture the expression supplied as argument by the user of the current function (enquo() wraps this expression in a quosure).

    enexprs() and enquos() capture multiple expressions supplied as arguments, including ....