The personality trait you are referring to is known as "upward slanting handwriting" or "upward slant." In handwriting analysis or graphology, the angle and direction of the slant in a person's handwriting can be interpreted as a reflection of their personality traits.
When the words in someone's handwriting don't touch the bottom line and slant upwards, it is considered an indicator of a particular personality trait. This trait is often associated with optimism, positivity, and an enthusiastic outlook on life. People with upward slanting handwriting are seen as hopeful, energetic, and open to new experiences.
It's important to note that graphology is not a scientifically validated method of personality assessment, and its interpretations can vary among different practitioners. While some believe in the insights provided by graphology, others view it more as a form of pseudoscience. Personality traits are influenced by various factors, and it's best not to draw significant conclusions solely based on handwriting analysis.