Nice Two Way Three Way Switch
Take a look at the switches in your home.
Two way three way switch. The three way switch is a variation of the standard single pole switch which controls a light only from one location. The controlled load is often a lamp but multiway switching is used to control other electrical loads such as an electrical outlet fans pumps heaters or other appliances. You may be surprised with what you have overlooked.
Three way switches control a light fixture from two locations in a room. Readers in most other countries should read two way or spdt for the american three way and intermediate crossover or dpdt switch for the american four way. 2 way touch switch used as 3 way switch.
A three way switch has no marking because there is no consistent on or off position. For 3 pcs of switches to control 1 lamp. The on off can change depending on the position of the second three way switch.