The image is a square that isn't fully closed. At the top the line is broken like an entrance. Inside the square are some lines that partially section it off. The lines at the bottom look like a capitalized letter T.
This is the Floor Plan icon for Windows 10
. Here we go. Optimized for 32x32 px, these are the simplest icons in the line style. Downloadable formats are PNG and SVG, among others. Icons8 icon pack is unique in providing a huge number of icons designed by the same team of four designers who create the new icons every working day in the same style and with the same quality. Same cool as the Bat Face, huh.