database columns: post_title vs post_name

I changed post_title, post_contents, and post_name to allow for utf by changing collating sequence to: utf8_general_ci

Then using add new post, I type for the title three Hebrew ALEFs.
The post_title is in Hebrew in the database, but the post_name has this value:

%d7%90%d7%90%d7%90

According to Charmap, ALEF has a hex value of 05D0.
So what does the d790 represent? Some other encoding?

I’m looking to write a program to mass upload a bunch of posts, so I need to know what to put in the post_name field, and what it is used for.

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