Inflammable means the same as flammable, 'liable to catch fire', 'easily ignited'. Because it is often taken to mean the opposite, it is best to avoid using it at all; in official use flammable and non-flammable are the preferred terms.
The mon, the central red disc, is called Hi-no-maru or sun-disc. The disc is set slightly towards the hoist. White symbolizes honesty and purity. Effective date: 5 August 1854.