What does 在庫 mean?
在庫 is a Japanese noun meaning “stockpile, stock” in English. It is written as 在庫 in kanji, ざいこ in hiragana, and zaiko in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
申し訳ありませんが、在庫がありません。
I'm afraid we are out of stock.