返へん信しんはがき

へ

ん

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は

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Meanings

return postcard

A postcard pre-addressed and often pre-stamped for the recipient to send back, commonly used in RSVPs, surveys, and business replies.

往おう復ふくはがき
A round-trip postcard consisting of two attached cards: one for sending and one for the reply. 返信はがき refers specifically to the reply half or a standalone reply card.
はがき
A general postcard. 返信はがき is a specific type designed for the recipient to send back.

返へん信しんはがき
Common mixed kanji-kana spelling; the kana portion avoids the less common kanji 葉書.
返へん信しん葉は書がき
Full kanji spelling; 葉書 is a standard but somewhat formal way to write はがき.

Compound of 返信 (へんしん, 'reply') and はがき ('postcard'). The word is straightforward and modern.