Rocky Bleier Signed Jersey Super Bowl Champion Authentic Collectible sunkist_orange_crate What does "New Old Stock

What does "New Old Stock (NOS)" mean here

The heavy paper stock required for multi-pass stone lithography — and especially for the embossing process — is simply more durable than the thinner papers used for newspapers

and taped up on the glass — facing outward to the sidewalk

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Rocky Bleier Signed Jersey Super Bowl Champion Authentic Collectible sunkist_orange_crate What does "New Old StockGet ready to ignite your passion for gridiron glory with this absolutely electrifying Rocky Bleier Signed Jersey Inscribed "S. B. IX X XIII XIV" (JSA)! This isn't just a jersey; it's a testament to a legendary career, meticulously crafted from a high quality, custom made fabric. This XL sized masterpiece boasts all sewn on elements, mirroring the authentic gear worn by heroes on the field, making it the crowning jewel of any serious memorabilia