To the question with the title:
"What's the point of a current source?" at What's the point of a current source?, I answered:
"It's implicit in the symbol, but explicitly it's a "constant current" source."
To me, that seemed like a perfectly sensible way to answer the gist of the question and, while terse, was accurate.
My answer was subsequently downgraded to a comment and, after searching the help files on Stack Exchange Meta, I could find no reason for the action.