An abbreviation for the term known as return of interest, which is used to calculate and determine if crypto investors will make net gains or net losses from their investments in certain crypto assets. One’s ROI is expressed as a percentage, which is determined by dividing the potential earnings / losses of an investment by the cost it took to make that investment happen. Investors in crypto can expect a negative ROI, which means the investment cost more than the amount of money it made, or a positive ROI which means the investment made more money than it cost to make the investment happen.