<p>[Online</a> Schedule of Classes Tutorial](<a href=“http://ecalso.berkeley.edu/eap/soc.html]Online”>http://ecalso.berkeley.edu/eap/soc.html)
here is a link about how to use it and what they mean.
Here is what it says concerning it:
"The course listing will also show “P 001.” This refers to two things. The P indicates that this is the Primary, or main, meeting of the course. The “001” refers to the lecture’s section number. Chem1A only has two lecture sections. "</p>