Matrix

Rarity: Common

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At a glance

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Notion

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Science and technology

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What Wikipedia says

In the manufacture of metal type used in letterpress printing, a matrix (from the Latin meaning womb or a female breeding animal) is the mould used to cast a letter, known as a sort. Matrices for printing types were made of copper.

Excerpt from the Wikipedia article “Matrix (printing)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: ActuaLitté, CC BY-SA 2.0, via Wikimedia Commons.