Nit

A nit is a unit of luminance equal to one candela per square metre. It is often used to quote the brightness of computer displays, which typically have luminances of 200 to 300 nits.

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A nit is also the common name for various types of lice eggs. See head lice, pubic lice, Pediculosis.

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A nit is also a term of abuse, indicating follishness