moietySystem

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: moietySystem

Indicates a relationship where an entity is classified or organized according to a moiety system, typically dividing a society or group into two complementary social halves.