What are the professional examination types for project managers?

There are a few bodies providing project management examinations. The most recognised providers are:

PMI (Project Management Institute)

APM (Association of Project Management, UK based body)

OGC (Office of Government Commerce)

Qualifications from PMI and APM include general practitioner certifications covering a broad range of Project Management skills.

The OGC commissioned PRINCE2 is a certification in a project management methodology and I would argue less useful than PMI and APM qualifications.