key

If one has some data that needs to be sorted or indexed, the key is the part of the data that is used to make comparisons (if sorting) or to enter into the .

For example, if one has a list of people the in the data might be names and addresses. One might sort by last name as a key or by street address as another key.

Title	key
Canonical name	Key
Date of creation	2013-03-22 17:22:21
Last modified on	2013-03-22 17:22:21
Owner	Mathprof (13753)
Last modified by	Mathprof (13753)
Numerical id	5
Author	Mathprof (13753)
Entry type	Definition
Classification	msc 68P10
Classification	msc 68P05