元 GEN, GAN, moto - origin, foundation
憲 KEN - law
秋 SHUU, aki - autumn
勤 KIN, GON, tsuto(meru) - work, be employed, be fit for
昭 SHOU - bright, clear
They are all used to represent national holidays in Japan.
元日 Ganjitsu - New Year's Day
憲法記念日 Kenpou Kinenbi - Constitution Day
秋分 Shuubun no Hi - Autumn Equinox
勤労感謝 Kinrou Kansha no Hi - Labour Thanksgiving Day
昭和 Showa no Hi - Showa Day