Why would light switch manufacturers write the words on and off on

Proper Wiring of a Single Pole Light Switch

Why do most light switches point up when the light is on and point

Types of Light Switches 22 Different types of Electrical Switches

Why would light switch manufacturers write the words on and off on

I saw a light switch turning on by itself. How is it possible? I

Reviews for RunLessWire Simple Wireless Light Switch Kit, No-Wires

Wiring a 4-Way Switch (DIY)

How to Install a Dimmer Switch

electrical - Why does one switch only work when another is on

10 Types of Light Switches and How to Choose

Switch - Wikipedia

How to wire a light switch

Double pole switch: what it is and how it works