tgz is often used as a file name suffix of
tar archives that have been compressed using
gzip, possibly by compressing it at creation time using
It is just a contraction of
tar.gz, which would be the suffix you would get if you first created a
tar archive and then compressed it with
On filesystems that enforces the old "8.3" naming rules of DOS, using
tgz as the file name suffix would enable one to store these files too.
If it "means" anything, it means "
tar archive". Just remember that in Unix, file name suffixes do not determine the format of the contents (it's just a help to the user). It used to be that many web browsers, for example, would download and decompress files while retaining the original name and suffix.