The Mikazuki (三日月) is a Japanese term that translates directly to "crescent moon." The characters break down as follows: 三 (mi) means "three," 日 (ka) means "day," and 月 (zuki, from tsuki) means "moon." The term is often used to describe the shape of the moon when it is in its crescent phase, specifically when it's about one to three days past the new moon phase, hence the "three-day moon." The crescent moon's elegant shape has inspired much poetry, art, and symbolism in Japanese culture, often representing beauty, impermanence, and the ebb and flow of life.

The term "Kakuyūgō" (核融合) can be broken down into its individual kanji characters: 核 (kaku): This character means "nucleus" or "core." It is commonly used in scientific terms related to nuclear energy or the atomic nucleus. 融 (yū): This character means "to melt," "to dissolve," or "to fuse." It is often used in contexts involving blending or merging substances. 合 (gō): This character means "to combine," "to join," or "to fit together." This term is used to symbolize a mythical demon sword that embodies fiery valor and the unlocking of brave, unstoppable power.