K.St.G.G. means Knight, Order of Saint Gregory the Great in Religion
Similar to K.St.G.G.
ACC - Austin Chinese ChurchACC - Anglican Church of Canada
ACCA - Association for Christian College Athletics
ACCW - Archdiocesan Council of Catholic Women
ACCW - Ascension Catholic Council of Women
ACCW - Albuquerque Council of Catholic Women
ACE - Aviation, Communications, and Evangelism
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