Which personality researcher named his traits with letters (similar to the way vitamins are named)?

Name: Which personality researcher named his traits with letters (similar to the way vitamins are named)?
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Question

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Raymond Cattell named his traits using the 16-factor model and used letters of the alphabet to label each trait. For example, he labeled the trait of extroversion with the letter E, while the trait of neuroticism was labeled with the letter N.

Which Personality Researcher Named His Traits with Letters (Similar to the Way