In shape this was a scalene triangle, obtained by cutting diagonally the vertically oblong banner.
From the en.wikipedia.org
A rhombic disphenoid has 4 congruent scalene triangle faces, and can fit diagonally inside of a cuboid.
From the en.wikipedia.org
Creating a scalene triangle that no sane driver would attempt to traverse in one trip is the new Grammy Museum in downtown Los Angeles.
From the chron.com
Many of its designs are based on a scalene triangle and have three main points to symbolize heaven, Earth and man and in other cases, the sun, moon and Earth.