• 黑(black; dark color (depicting a face blackened by smoke and fire))

A face covered by smoke and fire symbolizes the dark black color.

• 二(two; two horizontal strokes)
• ？(diagonal stroke indicating the number five)

A number carved between two horizontal lines resembles the ancient finger-counting method.

• 黑(black; dark color (depicting a face blackened by smoke and fire))

A face covered by smoke and fire symbolizes the dark black color.

• 二(two; two horizontal strokes)
• ？(diagonal stroke indicating the number five)

A number carved between two horizontal lines resembles the ancient finger-counting method.