Topfield TF 7000 HD PVRt User Manual page 3

The lighting flash with arrowhead symbol, within an
equilateral triangle, is intended to alert the user to the
presence of uninsulated "dangerous voltage" within the
product's enclosure that may be of sufficient magnitude
to consititute a risk of electric shock to a person.
The exclamation point, within an equilateral triangle, is
intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in
the literature accompanying the product.