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www.thespruce.com/polarized-electrical-plug-explanation-1908748

These are unpolarized plugs. Older lamps and other devices may well have unpolarized plugs, and some modern electronic devices, such as chargers on computers or cell phones, also have simple unpolarized plugs. It is generally not a problem to plug in an unpolarized plug to a polarized outlet in whatever way it will fit.

blog.1000bulbs.com/home/polarized-vs-non-polarized-electrical-plugs

The simplest way to tell if your receptacle (electrical outlet) is polarized is if you are able to plug in a three-prong plug (NEMA 1-15 ground Type B) or if a two prong-plug (NEMA 1-15 ungrounded Type A) can only fit with the larger prong on the left. An electrical plug is designed to complete an electrical circuit from your home’s electrical panel to your electronic device and back.

homeguides.sfgate.com/what-does-polarized-plug-mean-12431580.html

A polarized plug is easily distinguishable from other plugs because the blade on one side is wider than the other. Consequently, a polarized plug can only be inserted into an electrical outlet one ...

en.wikipedia.org/wiki/Polarized_plug

AC power plugs and sockets connect electric equipment to the alternating current (AC) power supply in buildings and at other sites. Electrical plugs and sockets differ from one another in voltage and current rating, shape, size, and connector type. Different standard systems of plugs and sockets are used around the world.

www.hunker.com/13414330/polarized-vs-nonpolarized-power-cords

A nonpolarized power cord has prongs of the same size. A polarized power cord has prongs of different sizes. You can only use a polarized plug with a polarized outlet. Polarization is a way of making sure a switched light or appliance isn't energized and can't shock you when the switch is off.

www.dictionary.com/browse/polarized

Polarized definition, of or relating to a medium that exhibits polarization. See more.

community.ebay.com/t5/Archive-Vintage/Electric-plugs-become-polarised-when...

Polarized plugs were introduced sometime in the early 1980s I _think_, but I have no reference for that right now. It's a little hard to tell from your photo, but that doesn't appear to be a polarized plug.

encyclopedia2.thefreedictionary.com/polarized+plug

Individually, a lamp module that controls one incandescent lamp sells for $14.95, a two-prong polarized plug that controls appliances and non-incandescent lamps sells for $16.95, a three-prong grounded plug that controls appliances and non-incandescent lamps sells for $16.95, a wall switch/dimmer that controls a light from one location for $14.95, a three-way wall switch/dimmer that controls a ...

www.thespruce.com/what-are-polarized-receptacles-1152786

If your circuit wiring includes a ground, simply replacing old polarized receptacles with new 3-slot grounded receptacles will give you grounded receptacles. If the circuits do not have grounds, installing grounded receptacles will not provide a ground. It will allow you to plug in 3-prong plugs, but there will be no ground protection at the ...

community.ebay.com/t5/Archive-Vintage/What-is-polarized-plug/td-p/1765223

I have noticed on discussions regarding vintage lamps the use of the term polarized plug. What is a polarized plug? When did they start using polarized plugs? I love to buy vintage lamps, usually with intent of selling them on ebay but then I cannot part with them!! I am unaware of this term and it ...