conventions - what is actually "EXTENT" in gis slang? -

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i not understanding extent parameter in gis applications. ex, in mapserver map file using

name "cgi-context-demo" status on size 400 300 **extent -2200000 -712631 3072800 3840000** units meters imagecolor 255 255 255 imagetype png

here extent means lower left x,y , upper right x,y. long,lat values not used here , value? how arrived?

extent area(square) specified left lower , right upper x , y. in example doesn't lon lat because it's different coordinate system.


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