• 自分じぶん — oneself
• 自みずから — oneself / personally
• 自己じこ — self
• 自動じどう — automatic
• 自動車じどうしゃ — automobile / car
• 自転車じてんしゃ — bicycle

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The character 自 originally depicted a nose — an ancient way of referring to oneself. It's now widely used in modern terms for personal identity, freedom, and voluntary action.