What are the idioms used in the names of twins?

dragon flying and phoenix dancing

Pinyin: lóng fēi fèng wǔ

Explanation: like a flying dragon; like a dancing phoenix. The original description is that the mountain is winding and unrestrained Magnificent. In the old days, it was superstitious; it was considered to be an imperial image. Now it is described as elegant and colorful calligraphy strokes. Most of them are cursive script.

Source: Su Shi of the Song Dynasty, "Biao Zhongguan Stele": "The mountain of Tianmu; the water comes out from there "The dragons and phoenixes are dancing; they are gathered in Lin'an."

Example: He was sitting in his seat; a piece of red paper was spread out in front of him; he was holding a writing brush; he was preparing to do something.