The phrase "is equal to 2 5 meter" seems to be a misinterpretation or typo of the artist's name. There is no standard measurement where "x-x-x" equals "2 5 meters."
This short write-up explains the expression "x - x - x" and shows why it can equal 2.5 meters under a consistent interpretation of the variable x. It includes the algebraic steps and a brief note on units and interpretation. x-x-x is equal to 2 5 meter download link
Danger signs when searching for "x-x-x is equal to 2.5 meter download link" : The phrase "is equal to 2 5 meter"