The term "single-hung pane" refers to a type of window with one fixed pane and one vertically sliding pane. There are several synonyms for this type of window, including "single-hung sash window," "single-sash window," "vertical slider," "single-sliding window," and "one-over-one window." These terms all describe the same basic design, with one pane that cannot move and another that slides up and down within the frame. Single-hung windows are a popular option for many homes and buildings due to their simplicity, ease of use, and affordable price point.