You know the thing I am referring to. A strip of metal (usually copper) is wrapped around a transformer to provide a shorted turn to stray field. A Flux Strap or Flux Band?

 
Transformer with Flux Strap or is it a Transformer with a Flux Band?

What do you call it?

I have searched in vain for a Standard way of depicting this thing (whatever you call it) on the schematic symbol. In the face of this vacuum, I have adopted my own which seems to be clear to people who have never seen the symbol before. This is an advantage over some other attempts to depict it, which have been misinterpreted as a metal shield between primary and secondary.

My way of depicting a Flux Strap on the schematic symbol

Are any readers aware of a Standard way of showing this, or even one that is commonly accepted in some circles?

20-07-2014 I return to report that nobody did come back to me with the details of a Standard way of depicting a flux strap, so I used the style of depiction that I had sketched out above. Here it is as used in my work.