A joint honours degree (also known as dual honours, double majors, or two-subject moderatorship) is a specific type of degree offered generally at the Honours Bachelor's degree level by certain universities in Ireland, the UK, Canada, Malta, and Australia.
Usually, joint honours degrees have higher requirements for entry than a single honours degree, requiring the approval of both departments concerned.
In some cases, students would have significantly more final year project work and could be examined on this by both departments in question.
Many British universities now have a dedicated Centre for Joint Honours Degrees which assists students with timetable structuring, etc.
In a single honours degree, one of these is a major and the other a minor; In a BA/BSc/BEng (Joint Hons.)