The term 'Boston Zone' can be broken down into three crossword solutions: ORR (3 letters), TEA (3 letters), and EST (3 letters). ORR stands for the Massachusetts Bay Transportation Authority's Orange Line, which is a rapid transit line that runs through the city of Boston. TEA stands for the Boston TEA Party, which was a political protest in 1773 where colonists dumped TEA into the harbor to protest taxation without representation. EST stands for Eastern Standard Time, which is the time zone in which Boston is located.