Basically there are four kinds of fraternities/sororities:
General (a.k.a. "social"), professional, service, and honorary.
It is "legal" to be a member of one of each type simultaneously, but most have rules against being in two of the same type of GLO.
For example, I couldn't be a member of Alpha Delta Pi and Phi Mu simultaneously, but I could be a member of Alpha Delta Pi and Delta Sigma Pi (which is a professional co-ed fraternity).
On the same note, I couldn't be a member of both Delta Sigma Pi and Phi Chi Theta which are both professional business fraternities.
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