Sterling bloc refers to a group of countries that use the British pound sterling as their currency. Synonyms for this term can include pound alliance, sterling community, and sterling sphere. These phrases all refer to a similar concept, where a group of nations have a close economic relationship due to their shared use of the British pound. Other possible synonyms could include UK currency zone, pound-based economies, and sterling federation. Regardless of the exact terminology used, the idea is clear - these countries have a strong connection through their shared use of the pound, and this can have significant economic and political implications.