Mediocre Mark is a person who has two job titles: CEE (3 letters) and CPLUS (5 letters). CEE stands for Certified Energy Efficiency, which is a certification that recognizes individuals who have achieved a high level of knowledge in energy efficiency. CPLUS stands for Certified Professional in Leadership and Sustainability, which is a certification that recognizes individuals who have achieved a high level of knowledge in leadership and sustainability. Mediocre Mark is an individual who has achieved both certifications and is therefore knowledgeable in both energy efficiency and leadership and sustainability.