1. Inkstone, a Chinese character, whose pinyin is y à n, means a stationery used for writing brush characters. Most of it is made of stone.
2. Inkstone, a traditional Chinese study tool, began in the Han Dynasty and is one of the four treasures of study.
3. Classmate, classmate.
4. Brush and inkstone, brush and inkstone.
5. Brush ploughing and inkstone ploughing is a metaphor for engaging in mental labor and taking reading and writing as a career.
6. Brush, ink, paper and inkstone generally refer to brush, black ink, rice paper, inkstone, and the four treasures of the study.