What does the line symbol refer to?

Running script, also known as running script, is said to have been created by Liu Desheng at the end of Han Dynasty.

As a widely used handwritten character in society, running script is based on regular script, which is smooth and convenient to write, not as difficult to distinguish vertically as cursive script, but also more vivid and concise than regular script. Writing a running script without stopping, writing a paper without lettering, gently turning it over and pressing it again, like flowing water, with few interruptions and lasting business.

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Because of its unique artistic expression and wide practicability, running script has been favored and widely circulated since its birth. After the golden period of Wei and Jin Dynasties and the development period of Tang Dynasty, running script reached a new peak in Song Dynasty and gradually occupied the mainstream position in various calligraphy styles.

Throughout the long history of calligraphy, the development of seal script, official script and regular script has ups and downs, while running script is immortal, which has always been a prominent study in calligraphy. Great calligraphers of past dynasties wrote a glorious history of running script development.