isweek M9803R - Chapter 1: A Quick Tour; Symbol Explanation

Chapter1
AQuickTour
SymbolExplanation
Earth( ground )TERMINAL
AC-Alternatingcurrent
DC -Directcurrent
Audiblecontinuity
Equipment protectedthroughout by Double Insulation ( Protection Class Ⅱ)
1-1
Caution
Caution,Possibility of electric shock