Heart of the matter

This time we are looking on the crossword puzzle clue for: Heart of the matter.
it’s A 19 letters crossword definition.
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Possible Answers:

GIST.

Last seen on: –Newsday.com Crossword – May 18 2020
Daily Celebrity Crossword – 11/19/19 TV Tuesday
Daily Celebrity Crossword – 9/27/18 Sports Fan Friday
USA Today Crossword – Jun 23 2019

Random information on the term “GIST”:

In computing, GiST or Generalized Search Tree, is a data structure and API that can be used to build a variety of disk-based search trees. GiST is a generalization of the B+ tree, providing a concurrent and recoverable height-balanced search tree infrastructure without making any assumptions about the type of data being stored, or the queries being serviced. GiST can be used to easily implement a range of well-known indexes, including B+ trees, R-trees, hB-trees, RD-trees, and many others; it also allows for easy development of specialized indexes for new data types. It cannot be used directly to implement non-height-balanced trees such as quad trees or prefix trees (tries), though like prefix trees it does support compression, including lossy compression. GiST can be used for any data type that can be naturally ordered into a hierarchy of supersets. Not only is it extensible in terms of data type support and tree layout, it allows the extension writer to support any query predicates that they choose.

GIST on Wikipedia