women's seats; women's section; women's gallery
Refers to designated seating or a section for women, such as in a theater, train, or public venue. The term is straightforward and not particularly formal or casual.
This theater has a women's section.
Old trains used to have ladies' seats.
Compound of 婦人 (fujin, 'woman, lady') and 席 (seki, 'seat'). The term is transparent and its meaning is directly derived from its components.