NOS Meaning in Chat or Text Messages Online

In chat/conversations, NOS is commonly used to refer to "Not Otherwise Specified" or "Nitrous Oxide System". However, in the context of e-commerce or online shopping, NOS can also stand for "New Old Stock". This refers to products that are brand new and unused, but have been sitting in storage for a long time.

For example, if someone is looking to buy a vintage camera online, they might come across a listing that says "NOS Canon AE-1". This means that the camera is brand new and has never been used, but it was manufactured several decades ago and has been sitting in storage ever since.