鐘鼓  / zhōng gǔ /
Bell and Drum 
Category:
Buddhist Terminology 
Description:
鐘中無鼓響,鼓中無鐘聲。 鐘鼓不相參,句句無前後。
In the sound of the bell, there is no drum,
In the sound of the drum, there is no bell;
Bell and drum do not interfere with one another,
Measure by measure, without beginning or end.
References:
星雲大師全集【書法類】中華文化佛教名詞 名相 The Complete Works of Venerable Master Hsing Yun: Calligraphy-Terminology 
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