key, index - significado y definición. Qué es key, index
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Qué (quién) es key, index - definición

MEASURE OF DISTURBANCES IN THE HORIZONTAL COMPONENT OF EARTH'S MAGNETIC FIELD AS AN INTEGER IN THE RANGE 0–9
Kp index; Kp-index; K index; A-index; Ap-index
  • Plot of ''a''-index vs. ''K''-index

Key (music)         
  • ii-V<sup>7</sup>-I progression]] in C [[File:Ii-V-I turnaround in C.mid]]
TONIC NOTE AND CHORD OF A MUSICAL PIECE
Major key; Key (Music); Musical key; Major Key; Key of D; Musical keys; Key coloration; Key relationship; Musical Key; Music key; Minor-key; Minor–key; Major-key; Key of E
In music theory, the key of a piece is the group of pitches, or scale, that forms the basis of a musical composition in classical, Western art, and Western pop music.
Key (cryptography)         
PIECE OF INFORMATION IN CRYPTOGRAPHY
Cryptography/Key; Secret key; Encryption key; Cryptographic keys; Cryptographic key; Key (cryptology); Cryptovariable; Cryptovariables
A key in cryptography is a piece of information, usually a string of numbers or letters that are stored in a file, which, when processed through a cryptographic algorithm, can encode or decode cryptographic data. Based on the used method, the key can be different sizes and varieties, but in all cases, the strength of the encryption relies on the security of the key being maintained.
Natural key         
TYPE OF UNIQUE KEY IN A DATABASE FORMED OF ATTRIBUTES THAT EXIST AND ARE USED IN THE EXTERNAL WORLD OUTSIDE THE DATABASE
Domain key; Business key
A natural key (also known as business keyData modelling: What exactly is a Business Key? by Roy, Rajiv Max.

Wikipedia

K-index

The K-index quantifies disturbances in the horizontal component of earth's magnetic field with an integer in the range 0–9 with 1 being calm and 5 or more indicating a geomagnetic storm. It is derived from the maximum fluctuations of horizontal components observed on a magnetometer during a three-hour interval. The label K comes from the German word Kennziffer meaning "characteristic digit". The K-index was introduced by Julius Bartels in 1939.

Ejemplos de uso de key, index
1. The key index touched the day‘s high of 12,78'.81 and a low of 12,510.75 points.
2. The key index had plummeted nearly 4 per cent on Wednesday.
3. The bourse‘s key index closed up more than 1 percent on Thursday.
4. Elsewhere in the Asia–Pacific, Australia‘s key index fell 3.2 percent, while India‘s Sensex was down 3 percent.
5. At one point, the Nikkei –– the key index of 225 leading stocks –– was down more than 4 percent.