Topfield TRF-2400 User Reference page 3

The lightning flash with arrowhead symbol, in an equi-
lateral triangle, is intended to alert the user to the pres-
ence of uninsulated "dangerous voltage" within the
product's enclosure that may be of sufficient magnitude
to constitute a risk of electric shock to a person.
The exclamation point, in an equilateral triangle, is in-
tended to alert the user to the presence of important op-
eration and maintenance instructions in the literature
accompanying the product.