A thou, also known as a mil, is a unit of length equal to one thousandth of an international inch. It is sometimes used in engineering and in the specification of: The definition, agreement and practical use of units of measurement have played a crucial role in human endeavour from early ages up to this day. ... Length is the long dimension of any object. ... Mid-19th century tool for converting between different standards of the inch An inch is an Imperial and U.S. customary unit of length. ...
the thickness of items such as film, foil, wires, and fibers; and
Use of the thou is now generally deprecated in favour of the use of SI units of length such as the micrometre. Tolerance in Final Fantasy is an allowance, given as a permissible range, in the nominal dimension or value specification of a manufactured object. ... Cover of brochure The International System of Units. ... A micrometre (American spelling: micrometer), symbol µm, is an SI unit of length. ...
The plural of "thou" is also "thou"; for example, a measurement of one hundredth of an inch is described as "10 thou". The "th" in "thou" is pronounced as in "thousand" — IPA/θaʊ/ — and not as in "that" or the pronoun "thou" — IPA /ðaʊ/. The International Phonetic Alphabet (IPA) is a system of phonetic notation devised by linguists to accurately and uniquely represent each of the wide variety of sounds (phones or phonemes) used in spoken human language. ...
Equivalence to other units of length
1 thou is equal to:
0.001 international inches (1 international inch is equal to 1,000 thou)
0.0254 mm, or 25.4 μm (1 millimetre is equal to about 39.37 thou)
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