- 5 paths to truth
- 5 virtues
- 12 animals
- agreeableness
- air
- Allport, Gordon
- Big Five
- black bile
- blood
- body type
- Cattell, Raymond
- Chinese zodiac
- choleric
- comparative anatomy
- Confucianism
- Confucius
- conscientious
- cranioscopy
- earth
- ectomorphic
- endomorphic
- extroversion
- Eysenck, Hans
- factor analysis
- fire
- Galen
- Gall, Franz
- Hippocrates
- humors
- introversion
- melancholic
- mesomorphic
- neuroticism
- openness
- phlegm
- phlegmatic
- phrenology
- psychoticism
- sanguine
- Shelfon, William
- temperaments
- traits
- water
- yellow bile