The kanji 封 primarily conveys the idea of sealing, closing, or confinement. It implies the act of making something secure, preventing access, or limiting something's scope. It often relates to the act of closing something, such as an envelope, or establishing a boundary.

・On-yomi (音読み): ホウ (hō) ・Kun-yomi (訓読み): ふう (fū)

⚫︎封筒 Translation: envelope ⚫︎封鎖 Translation: blockade; closure ⚫︎開封 Translation: unsealing; opening (e.g., a package)

The kanji 封 is a phono-semantic compound. The phonetic component is 丰 (hō, meaning abundant or flourishing), and the semantic component is 寸 (sun, a unit of measurement). Together, these components convey the idea of "sealing" or "closing" something, perhaps in the sense of making it secure and complete or measured. The original form may have depicted sealing a container or marking the boundaries of something.