回 回 huí Strokes6 Radical 囗 — enclosure Made of 囗 enclosure 口 mouth How it's builtIdeograph — the meaning is built from its parts Play the animation
忆 忆 yì Strokes4 Radical 忄 — heart Made of 忄 heart 乙 second How it's builtPhono-semantic — one part hints at the meaning, another at the sound Play the animation More about the character 忆