AT&T System 25 - Manual (Page 4)

THE FOLLOWING SYMBOLS AND PICTOGRAPHS
APPEAR ON THE EQUIPMENT
SYMBOL
The exclamation point
w i t h i n a n e q u i l a t e r a l
t r i a n g l e i s i n t e n d e d
to alert the user to
the presence of
important operating
and maintenance
(servicing) instructions
ELECTRICAL SHOCK
Warns of the danger
o f e l e c t r i c a l s h o c k
from hazardous voltages
present within the
c o n t r o l u n i t
Warns of the risk of
f i r e i f t h e a i r f i l t e r
is not in place
b