<p>"EC" implies that there are two words.</p>
<p>The only two word combination related to academics that I thought of was 'extra credit'.</p>
<p>'Extracurricular' is one word, so if you're intuitively trying to think of two words, that shouldn't come into mind.</p>
<p>....And yes, I realize the reason why 'EC' is used for 'Extracurricular', but because I'm not a forum regular, and just didn't think of that.</p>
<p>My sincere apologies to you, sir.</p>
<p>Plus, I'm heavily a math and science person, so........you get the picture.</p>