Trans individuals are people whose gender identity and expression are not what is perceived or do not match the stereotypical gender norms associated with the assigned gender at birth. Gender identity is how we view ourselves. While gender identity is not visible, it is the internal sense of being a woman, man, both, or neither, or any other genders. However, gender expression is visible, meaning an individual can express their gender through clothing, hair, mannerisms and other methods of expression. Though gender expression is outward, it is not always an indication of an individual’s identity. The only way to be sure of a person’s gender is if they tell you.
https://www.temple.edu/life-temple/diversity-inclusivity/preferred-name-use
Preferred Name Use