In the HEXACO model of personality traits, the "X" refers to EXTRAVERSION. This model comprises six (6) personality dimensions.
The HEXACO model comprises six dimensions of human personality: Extraversion (X), Humility-Honesty (H), Agreeableness (A), Emotionality (E), Conscientiousness (C), and Openness to new experiences (O).
This model was developed by Costa and McCrae and Goldberg, using a similar strategy to those used to identify and/or recognize taxonomic traits.
The H dimension of human personality is a distinctive feature of the HEXACO model, which is inversely associated with different criteria (e.g. criminal activity, unethical behaviors, etc).
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