Window blinds in Dixon Hill's office
Blinds were a type of window covering consisting of vertical or horizontal slats connected by a cord that could be pulled to draw them shut.
The 602 Club on Earth had blinds on its windows. (ENT: "First Flight")
Dixon Hill's office windows had horizontal blinds on them. (TNG: "The Big Goodbye")
In 1958, a train bound for Pittsburgh had blinds on its windows. (ENT: "Carbon Creek")
In 1986, Doctor Nichols' office at Plexicorp also had blinds on the inside windows. (Star Trek IV: The Voyage Home)