The term 'billion prefix' refers to words that are used to denote a billion of something. Giga, tera, india, EON, islam, and AIRE are all prefixes that can be used to denote a billion. Giga is a prefix derived from the Greek word for giant, and it is used to denote a billion of something in the metric system. Tera is a prefix derived from the Greek word for monster, and it is also used to denote a billion of something in the metric system. India is a prefix derived from the Latin word for one billion, and it is used to denote a billion of something in the metric system. EON is a prefix derived from the Greek word for age, and it is used to denote a billion years. Islam is a prefix derived from the Arabic word for one billion, and it is used to denote a billion of something in the metric system. AIRE is a prefix derived from the French word for one billion, and it is used to denote a billion of something in the metric system.