In Freudian psychology, an invert is a homosexual.
Invert is also the common name for a mixture of oil (petroleum) and diesel fuel. A by-product of oil well drilling, it is corrosive on clothing and skin, and highly flammable.
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Inverts are perhaps the most spectacular of a postage stamp errors, not only because of the striking visual appearance, but because they are almost always quite rare, and highly valued by stamp collectors.
An invert may be characterized as an "inverted center" or "inverted frame" when the underlying paper is watermarked or otherwise carries a basic orientation.
The Dag Hammarskjold invert of 1962 consists only of a misprinted yellow layer, and it is not immediately clear that the white area is not a deliberate element of the design.
The "Nixon invert" was a reputed invert error of the Richard Nixon memorial postage stamp issued by the United States in 1995.
The first public notice of the invert came in the form of an announcement by Christie's that they planned to auction a single copy of the invert on February 1, estimating its value at $8,000-$10,000.
By comparison, the story of the Inverted Jenny discovery was known in minute detail and verified by multiple persons.
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