Jalousies (noun) – a window made of adjustable glass louvers that control ventilation.
This was found in “A Rose for Emily,” on page 4, 4th paragraph. “This behind their hands; rustling of craned silk and satin behind jalousies closed upon the sun of Sunday as the thin, swift clop-clop-clop of the matched team passed: “Poor Emily.””
Knowing the definition of the word, I understand that it was used to represent a window behind the craned silk and satin. By “behind their hands,” Faulkner is talking about people women in silk and satin dresses(craned silk and satin) who spy on Emily and Homer, and talk about them behind the closed windows.