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A letter naming a socket pattern.
Also known as: Socket type letter, Plug type classification
The letter designations classifying the domestic plug and socket patterns used around the world.
Classify the domestic plug and socket patterns in use in different countries by letter.
Contexts: Public information
Not a standard issued by any body: the letters were assigned in a United States trade publication and became the common reference by use rather than by adoption, which is why no standards document defines them.
Contexts: Public information
Several letters cover patterns that are physically incompatible with one another, so a shared letter does not guarantee that a plug will fit.
Type letters group patterns loosely; a shared letter does not guarantee compatibility.
Contexts: Public information
A single capital letter, from A upward, used in reference tables against a drawing of the pin arrangement it names.
A fuller structured visual breakdown is not yet documented for this symbol.