I was casually browsing Chinese artist blog, and the artist states that he/she uses 圆珠笔 签名笔 and 水笔 as medium for art.
I know what a ballpoint pen is. However, I am not sure what kind of pen is 签名笔. Is it a fountain ink pen?
Additionally, I am very confuse about the term 水笔, since I thought it refers to watercolor. However, when I search pictures on internet, only pen pictures appear.