What does 国産 mean?
国産 is a Japanese noun meaning “domestic products” in English. It is written as 国産 in kanji, こくさん in hiragana, and kokusan in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
しかし、国産ワインといっても、国内で瓶詰めされたものは全て国産ワインとなります。
Having said 'domestic wine', anything bottled domestically is deemed to be domestic wine.