Lenco DVL-1955 - Manual (Page 3)

Caution
1
The lightning flash with arrowhead symbol, within an equilateral triangle
is intended to alert the user to the presence of un-insulated “dangerous
voltage” within the products enclosure that may be of sufficient magnitude
to constitute a risk of electric shock to the persons.
The exclamation point within an equilateral triangle is intend to alert the
user to the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the appliance.