|visits||member for||2 years, 3 months|
|seen||Feb 3 at 16:48|
This answer seems dangerously Ruby-centric to me. There's languages where all Strings are immutable, that doesn't make them all Symbols. So I don't know if there is a really good language-agnostic definition of Symbols- it depends on each language. Generally they are used for identifiers/keywords/names.