Final answer:
The 'acts discreditable' rule refers to behaviors by CPAs that can harm the reputation of the profession, including unethical or illegal acts like fraud and breaches of confidentiality.
Step-by-step explanation:
The rule in the AICPA Code of Professional Conduct for "acts discreditable" specifically refers to behaviors or actions taken by CPAs that can be seen as damaging to the profession's reputation. These may include a range of unethical or illegal activities, such as fraud, confidentiality breaches, discrimination, and failure to follow applicable professional standards, among others. CPAs are expected to adhere to the highest levels of integrity and professionalism and avoid any actions that could bring discredit to themselves or the accounting profession.