You probably heard the words "bull market or bullish market" but what is it? this refers to a positive trend in the prices of a market. It is broadly used not only in the cryptocurrency space but also in the traditional markets. On a simpler explanation it means that the market prices are going up over a short period of time.
I have read somewhere that the reason why they decided to use the word "bull" is because a bull's horns are curved upward and this perfectly represents the market curves when the prices are on an upward trend.