the gods
Synonym discussion
Sense: idiom/1
These four terms all refer to the highest, cheapest seats in a theatre, but they differ in register and cultural context. 'The gods' is the most widely understood term in British and Commonwealth theatre usage — it carries a playful, slightly old-fashioned flavour. 'Nosebleed seats' is strongly informal and American in origin; it emphasises the extreme height with a touch of humour and is also used for sports stadiums. 'Upper circle' is a neutral, standard tier name in many British theatres — it refers to the same area but lacks the informal or affectionate tone of 'the gods'. 'The gallery' is a historical term from 19th-century theatres and is now rarely used as a practical tier name, though it survives in expressions like 'playing to the gallery' (seeking popular approval). If you are buying tickets in London, 'the gods' and 'upper circle' are both current, with 'the gods' being the friendlier, more informal choice.
Etymology
This sense of 'the gods' comes from 18th-century British theatre slang. The highest gallery in a theatre was so far above the stage that the audience seated there seemed to be closer to heaven — or to the gods of Greek and Roman mythology who were often shown descending from above the stage in theatrical machinery. The nickname caught on in London theatres and later spread to other English-speaking countries.