'Tíng·zi jiān' is a Shanghainese term referring to a small, often cramped attic or rooftop room—typically found in old-style Shanghai lane houses (lilong). Though the characters literally suggest 'pavilion' (亭), 'suffix for nouns' (子), and 'room/space' (间), the term has no connection to pavilions; instead, it evolved historically to describe the tiny, poorly ventilated top-floor apartments built in early 20th-century Shanghai housing. These rooms were usually rented by students, artists, or low-income residents due to their affordability and limited size.

Today, 'tíng·zi jiān' carries strong cultural and nostalgic connotations, evoking images of intellectual struggle, literary inspiration (many famous writers lived in them), and urban history. It’s not used generically for any attic—it specifically references this socio-architectural phenomenon unique to Shanghai. While modern renovations have largely eliminated such spaces, the term remains widely understood and frequently appears in literature, film, and historical discussions about Shanghai life.