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"Encyclopedia of Palmistry Learning": Thumb

From an engineering perspective, the thumb is a pioneering work. The thumb represents the strength of a person's willpower and character. The thumb is a measure of mental strength and driving force, and it represents how much innovation we have. The shape of the thumb also foreshadows how an individual will exert his talents; whether it is a logical response or an instinctive response, whether it is passive or aggressive, anticlimactic or persevering.