An umbrella or parasol was a device designed to protect against rain or sunlight.
One of the post-atomic horror trial spectators was carrying a damaged umbrella. (TNG: "Encounter at Farpoint", "All Good Things...")
In 2364 several characters in the Dixon Hill holodeck program carried an umbrella. (TNG: "The Big Goodbye")
In 2376 Gedrin asked Kathryn Janeway whether she would run from rain and get wet anyway or accept the facts and walk with dignity. Janeway replied that she'd bring an umbrella. (VOY: "Dragon's Teeth")