There are many kinds of symbols according to CAD standard. For examples, there's a symbol for sprinkler and also a symbol for a pump, say inline pump. Also in Revit there are both annotation and symbolic lines. Both could be used for "symbols".
1) What's the real difference between annotation and symbolic lines in Revit?
1) For a sprinkler, I would show it in Plan view as annotaions. But I'm not sure if it make sense to show it as symbolic line.
2) For a pump, how did you describe it on the drawing in Revit? Show that pump symbol as annotatation, or just some lines(symbolic lines)?