In socionics, SEI stands for ""Sensory Ethical Introvert,"" and it is also referred to as ISFp, which indicates the corresponding MBTI type, ""Introverted Sensing Feeling Perceiving."" SEI/ISFp individuals are characterized by their strong sensory perception, focus on personal experiences, and a harmonizing and empathetic nature. They tend to be warm, caring, and value emotional connections. Additionally, they possess a talent for aesthetics and enjoy creating a pleasant atmosphere. Socionics provides a more detailed and comprehensive understanding of the SEI type, including relationships with other types, information processing preferences, and intertype dynamics.

The differences between socionic types and MBTI types lie in their theoretical foundations and approach to personality. While both systems are based on Carl Jung's work, the socionics model extends Jung's ideas and incorporates additional elements. Socionics places a stronger emphasis on intertype relationships and dynamics, analyzing how different types interact and influence each other. It also introduces the concept of ""information metabolism,"" which explores how individuals process information based on their cognitive functions. This provides a more nuanced understanding of personality and interpersonal dynamics. Socionics also assigns four-letter acronyms to types differently than MBTI, which leads to variations in type labeling and categorization. Overall, socionics offers a more intricate and elaborate framework for understanding personality and its complexities.