Square meter
A square meter was a unit of area in the metric system, equal of one meter . 

This unit of measure was used or understood by several species and organizations including the Federation, Klingons, Krenim, and Mislenites.

Comparative units of area
 When Kor retold the story of how he, Kang and Koloth battled against T'nag's army, the story ended with them finding "the mountainside [..] covered with dead so that not a square meter of ground could be seen" ()

 When Chardis described the swarm species' attack on his freighter, he explained that their ships covered every square meter of his hull, before extracting energy from all the ship's power systems ()

 When Seven of Nine began experiencing flashbacks and starts acting erratic, Captain Kathryn Janeway assembled a team to analyze every square meter of the cargo bay where Seven had been residing, hoping to find something that might shed light on her actions. ()

 When a magnetic organism transported aboard the  and took over the ship's systems, Kirk had Spock rig a low-frequency shield on the navigation console. Spock did so, explaining that "it would have a very small field," adding, that its coverage was "only an area three meters square."  ()

 When  attempted to exit the trash exhaust of the  to gain access to the  via its access port 101A,  warned that "this door is very wee. I mean, you know, small. It's four square meters, tops. It's gonna be like jumping out of a moving car, off a , into your shot glass." ()

 When the Krenim weapon ship commanded by Annorax first encountered USS Voyager in  an alternate 2374, he determined that their ship's temporal shielding was generating a level 9 temporal disruption, which was interfering with his mission. Prior to his attempt to neutralize Voyager, he requested to Obrist that he prepare to collect samples, specifically, "Two lifeforms, [and] 10 square meters of the hull." ()

 During the Enterprises visit to Ligon II in 2364, Captain Jean-Luc Picard observed several lengths of metal in the yard outside. When he inquired to Data what they were for, Data explained, "Uncertain, sir. However, joined together they would make a rectangle or square enclosing 121 square meters. If put end to end vertically, they would make a pole 44 meters high, or two of 22 meters." ()

 During the Hirogen takeover of USS Voyager in 2374, Karr directed the expansion of the ship's holodecks. With the assistance of Harry Kim, who cut through the bulkheads on Decks 4 thru 6, and expanded both holodeck grids by 5,000 square meters. When Karr requested more, Kim explained that he couldn't without compromising Voyagers primary systems. ()

External link 

Measurements