Orchestral players normally refer to themselves as "fiddle players"; as a rule it's a form of inverse snobbery, as the majority of them tend to look down on the rest of us.  The "under the chin" position is a fairly recent innovation, as is the shoulder rest.  Personally, I dislike shoulder rests, as they tend to force you into a stiff and unnatural stance, though I imagine that they are indispensible if you want to play in high positions or are unable to hold the instrument in a relaxed fashion.

Malcolm