1. Mother of pearl Hexagon & heptagon inlay position markers on fingerboard. 2. The linear interpolation in such cases will produce a plausible single heptagon . 3. These 4 symmetries can be seen in 4 distinct symmetries on the heptagon . 4. From each collar hangs a white heptagon symbolic of the united seven authorities. 5. From the collars hang heptagons , the seven sides representing the union of seven councils. 6. The Brazilian 25-cent coin has a heptagon inscribed in the coin's disk. 7. In 2014 MESA was bought by Heptagon 8. Seven pendant lamps and a glass Heptagon ( seven-sided polygon ) decorate the altar. 9. The area of a regular heptagon can be expressed in terms of the roots of a cubic. 10. The illustration shows an example in which the seven points are the vertices of a regular heptagon .