Distance Matrix in QGIS, which SRID

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I read several threads about it.. How to get $length in meters in QGIS?How to join attributes from nearest point in QGIS?QGIS, CRS's and metric measurements of distance matrix and nearest neighbour

and others, here and in other web sites. Nowhere I can find which SRID to use for calculating the distance in meters. My area of interest is the World...anyone please can help me??



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