<p>Silly question: </p>
<p>Go ahead and laugh: what do class schedule abbreviations stand for?</p>
<p>Ex: tr, tw, wr???</p>
<p>Days of the week 
Most classes at columbia are either MW (Monday and Wednesday, same time on each day) or TR (Tuesday and Thursday). Languages, science labs, arts classes, etc are more variable. </p>
<p>M - Monday
T - Tuesday
W - Wednesday
R - Thursday
F - Friday (rare, except for language classes)</p>