Used to refer to a person's height, often in contexts like forms, descriptions, or comparisons. Related to the expression 背の高い (tall).
See also: 背の高い
Please write your height on the resume.
He wasn't tall enough to join the team.
Compound of 背 (se, 'back, stature') + の (no, possessive particle) + 高さ (takasa, 'height'). A straightforward descriptive phrase.