Segregation refers to the concentration of genders in different types of jobs. 

"Definitions and measures of segregation vary because patterns of segregation can be considered in absolute terms – that is, the actual dominance of one sex in a par-
ticular occupation or workplace – or in relative terms, that is the share of a sex relative to the expected share, as women tend to be under-represented at an aggregate
level among the employed population.

Both approaches appeal to common-sense understandings of segregation; the absolute female or male share relates to the literal meaning of gender segregation at work, that is, whether men and women do work alongside each other or work in occupations or workplaces dominated by their own sex." https://data.europa.eu/doi/10.2838/748887