[wnight]

If sigil means non-ascii character, there are six. If you use it to mean name-modifier (changes what the following string means) there is one, the colon. What did you mean?

And yes, colon is also the or in the ternary operator.

But there are still less than Perl, for the same length of code, and the code is simpler - .call() the thing if it.respond_to?(:call)

[chromatic]

What did you mean?

A punctuation character considered as part of an identifier by way of a parser rule. The ? in respond_to?, in this case.