The term 'Big Number' can refer to a variety of different terms, including Zillion (7 letters), Googol (6 letters), ARIA (4 letters), HIT (3 letters), and MYRIAD (6 letters). Zillion is an informal term used to refer to an extremely large number, while Googol is the name for the number represented by a 1 followed by 100 zeroes. ARIA is a term used to refer to a very large number in Italian, while HIT is a term used to refer to a MILLION in Chinese. MYRIAD is a term used to refer to an indefinite but very large number, and MILLION is a term used to refer to a thousand thousands.