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What (who) is certified signature - definition
HIGH-PRECISION TIME PIECE
Certified chronometer; Certified Chronometers; COSC certified chronometer
![Movado Ermeto]] mechanical chronometer.](https://commons.wikimedia.org/wiki/Special:FilePath/1928 Movado Ermeto chronomètre.jpeg?width=200 "Movado Ermeto]] mechanical chronometer.")
Metric signature
MATHEMATICAL CONCEPT
Signature change; Signature (physics); Euclidean signature; +---; -+++; Lorentz signature; Mostly Plus; Mostly Minus; Signature of the metric
In mathematics, the signature of a metric tensor g (or equivalently, a real quadratic form thought of as a real symmetric bilinear form on a finite-dimensional vector space) is the number (counted with multiplicity) of positive, negative and zero eigenvalues of the real symmetric matrix of the metric tensor with respect to a basis. In relativistic physics, the v represents the time or virtual dimension, and the p for the space and physical dimension.
Certified check
BANK-VERIFIED CHECK
Certified bank check; Certified Check; Certified cheque
A certified check (or certified cheque) is a form of check for which the bank verifies that sufficient funds exist in the account to cover the check, and so certifies, at the time the check is written. Those funds are then set aside in the bank's internal account until the check is cashed or returned by the payee.
time signature
![String Quartet No. 2 in F major]], showing a multiple time signature](https://commons.wikimedia.org/wiki/Special:FilePath/Tchaikovsky String Quartet in F excerpt.png?width=200 "String Quartet No. 2 in F major]], showing a multiple time signature")
SPECIFICATION OF BEATS IN A MUSICAL BAR OR MEASURE
Common time; 4/4 time; Meter signature; Time signatures; Time-signature; 4/4 beat; Time (music); 6/8 Time; Irregular time signatures; Irregular time signature; Odd time signature; Odd time signatures; Unusual time signature; Unusual time signatures; Waltz time; Time Signature; Additive meter; Eight to the bar; Eight to the Bar; 6/8 time; Complex time signature; Complex meter; Commontime; 13/8; Three-quarter time; 𝄴; Common-time; Usual time signature; Mixed meter; Asymmetric time signatures; Irrational time signature; Irrational meter; Non-dyadic time signature; Non-dyadic meter; Odd meter; 4/4 music; 5/4 music; 7/4 music; 11/4 music
(time signatures)
The time signature of a piece of music consists of two numbers written at the beginning that show how many beats there are in each bar.
N-COUNT
Wikipedia
Chronometer watch
A chronometer (from Ancient Greek χρονόμετρον; Literally, a measurer of time) is an extraordinarily accurate timepiece, with an original focus on the needs of maritime navigation. In Switzerland, timepieces certified by the Contrôle Officiel Suisse des Chronomètres (COSC) may be marked as Certified Chronometer or Officially Certified Chronometer. Outside Switzerland, equivalent bodies, such as the Japan Chronometer Inspection Institute, have in the past certified timepieces to similar standards, although use of the term has not always been strictly controlled.
