Vector group

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

In electrical engineering, a vector group, officially called a connection symbol, is the International Electrotechnical Commission (IEC) method of categorizing the high voltage (HV) windings and low voltage (LV) winding configurations of three-phase transformers.

Excerpt from the Wikipedia article “Vector group”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Antonio Pedreira, Public domain, via Wikimedia Commons.