I thought the number stood for daily "hits" or visits, until I tried an Alexa search on my main website, The Xenophile Historian. According to my counter I'm getting about 800 hits a day, but the number Alexa gave me is almost 4,000. Hmmmm . . .
http://www.alexa.com/data/details/?url=xenohistorian.faithweb.com
An HTML page with 2 images makes total of 3 HTTP GETs to your web server, thus logging 3 requests in the log.
I loaded your web page and saw these:
http://xenohistorian.faithweb.com/exphorsa.gif
http://xenohistorian.faithweb.com/xentitle.gif
http://xenohistorian.faithweb.com/vilani.gif
http://xenohistorian.faithweb.com/ie5.gif
http://xenohistorian.faithweb.com/smile.gif
http://xenohistorian.faithweb.com/address2.gif
http://xenohistorian.faithweb.com/Rusbible.jpg
1 HTML page plus the 6 images is:
800 * 7 = 7200 hits