What is a quadruple major?

A major is a point of study. If you are majoring in Communications, then your classes focus on that subject and your degree will say Bachelors Degree of Communications.

Jamaica IS a country in the Caribbean

It's not a major, it's a minor. The relative minor of B major is G# minor.

They are called major prophets, as their books had more pages and more prophecies .

Sirius (brightest star in the night sky, 6th closest star to the sun, also a binary star) Canis Majoris VY (largest star known to man)