What do you mean by how to design the leak sign?

This sentence means how to use missing elements in trademark design.

Leak logo design is the core of brand image and represents the essence and values of the company. A successful logo design can immediately attract people's attention and convey brand ideas, values and commitments. When designing the missing bid, we should follow the principles of simplicity and representativeness to ensure that the designed missing bid can be concise and easy to understand, grasp the essence of the brand, and be unique and recognizable.