1. Concept stock: refers to the stock with special connotation, which is usually regarded as the theme of stock selection and speculation and has become a hot spot in the stock market.

It has a specific name, thing, theme, etc. For example, financial stocks, real estate stocks, asset restructuring stocks, brokerage stocks, Olympic theme stocks, insurance stocks, futures concepts, etc. are all called concept stocks.

2.OTA: an "over-the-air download" technology used by mobile phones and other terminals. With this technology, users can download to fix terminal vulnerabilities or upgrade some functions.

OTA concept stock: It is a concept stock based on OTA technology.