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I thought that it might be a sound, but it may also mean bubble wrap. I just want to clarify. Thank you very much.

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プチプチ{HLLL} is an onomatopoeia for the sound when bubbles (or something swollen) pop continually. It's reduplication of プチ(っと).

プチプチ{LHHH} is the most well-known name of bubble wrap or 気泡緩衝材 (although it's a brand name). Obviously it's named after the onomatopoeia.

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