Age (since the torrent was created)
h = Hours
d = Days
w = Weeks

isoHunt Rank: Based on combination of seeds/leechers, votes/comments, query matching and freshness. Best overall sorting.

You can also sort each column by torrents' Age, Seeds, etc. by clicking on column headings.

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Seeds (uploaders who have the complete file)

Leechers (uploaders who are also downloading)