You will normally find this kind of thing at http://docs.moodle.org .
To answer your question. Here is the fineprint
If you are intending to use the name to advertise commercial generic Moodle services (eg Moodle Hosting, Moodle Support, Moodle Certification etc), then you must seek direct permission in writing from Martin Dougiamas via the moodle.com helpdesk, in accordance with normal trademark restrictions.
There are no restrictions on how you use the name in other contexts (for example, if you use Moodle just to provide courses then you can use the name freely to refer to it.)
This also refers to the logo.
Comparisons and advocacy
Moodle Logo Usage
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