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What (who) is retina signature - definition
PLANETARY NEBULA IN THE CONSTELLATION LUPUS
Retina Nebula; Retina nebula
![MUSE instrument]] and the Adaptive Optics Facility.](https://commons.wikimedia.org/wiki/Special:FilePath/The planetary nebula IC 4406 seen with MUSE and the AOF.jpg?width=200 "MUSE instrument]] and the Adaptive Optics Facility.")
Retina display
BRAND NAME FOR HIGH RESOLUTION DISPLAYS FEATURED IN SEVERAL PRODUCTS FROM APPLE INC.
'retina' display; Retina Displays; Retina HD Display; Retina HD display; Retina 5K display; Retina 5K Display; Apple Retina Display; Retina Display; Retina screen; Liquid Retina; Super Retina
Retina Display is a brand name used by Apple for its series of IPS LCD and OLED displays that have a higher pixel density than traditional Apple displays. Apple has registered the term "Retina" as a trademark with regard to computers and mobile devices with the United States Patent and Trademark Office and Canadian Intellectual Property Office.
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.
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
IC 4406
IC 4406, sometimes known as the Retina Nebula, is a planetary nebula near the western border of the constellation Lupus, the Wolf. It has dust clouds and has the shape of a torus. Despite this, it looks somewhat rectangular because it is seen from its side as viewed from Earth, almost in the plane of its equator.
