Greek life terminology (fraternities/sororities)?

What is the meaning of the term "sand/sands"?
I have seen it used between orgs of the MGC and NPHC at my university.
Are non-greek persons not allowed to know its meaning?
I assume non-greeks are not allowed to use it of course, I was just curious of what it meant.

Anonymous2010-05-18T16:29:59Z

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I've heard it used as a synonym for initiation or the process of becoming a full member.

Anonymous2016-12-15T23:07:17Z

Greek Life Terminology

Anonymous2010-05-17T17:07:55Z

It is to tell you that the word sand can also be used plurally.