Pledge notice: a notice to seek help or support from the public. Such as finding a job, looking for someone, asking for rent, recruiting and other notices. 3. Notice: A notice that the public knows and attracts everyone's attention. Such as correction, change, opening, recognition, apology, loss reporting, relocation, wedding and other notices. The notice is characterized by 1 and universality; 2. Openness; 3. Voluntary.