The kanji 単 primarily conveys the idea of "single," "simple," "alone," or "only." It suggests something that is singular, not complex, and often independent or without companions. This can refer to an individual item, a straightforward action, or a singular state of being.

・On-yomi (音読み): タン (tan) ・Kun-yomi (訓読み): ひと(り) (hitori) (meaning "one person" or "alone")

⚫︎簡単（かんたん） Translation: Simple; easy. ⚫︎単純（たんじゅん） Translation: Simple; mere; simpleminded. ⚫︎単語（たんご） Translation: Word; vocabulary.

The kanji 単 is a phono-semantic compound (形声文字; けいせいもじ). The left side is a radical (偏; へん) derived from a simplified version of the character 辛 (meaning "bitter" or "punishment"). The right side is a simplified version of the character 車, meaning "car" or "vehicle". The original meaning of 辛 was not originally associated with bitterness, but rather represented a branding iron. This branding iron, representing a mark of some kind. While the etymology is debated, the combination suggests the idea of a single mark or a single vehicle. The simplification over time led to the current form representing a "single" or "only" aspect. The meaning evolved to encompass the concepts of "single," "alone," or "simple."