You may want to check with the US copyright office? I'm pretty sure that large national groups (like mine) have copyrighted their name.
Other than that, there's really no way for you to know every single local's Greek Letter combination. Greek pages would be another effective way to do this.
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SN -SINCE 1869-
"EXCELLING WITH HONOR"
S N E T T
Mu Tau 5, Central Oklahoma
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