Look what I found in Yahoo Finance! Chaos--just for you!
Short interest
Total number of shares of a security that investors have sold short and that have not been repurchased to close out the short position. Usually, investors sell short to profit from price declines. As a result, the short interest is often an indicator of the amount of pessimism in the market about a particular security, although there are other reasons to short that are not related to pessimism. For example, hedging strategies for mergers and acquisition as well as derivative positions may involve short sales.
Short interest theory
The theory that a large interest in short positions in stocks will precede a rise in the market prices, because the short positions must eventually be covered by purchases of the stock.
Short position
Occurs when a person sells stocks he or she does not yet own. Shares must be borrowed, before the sale, to make "good delivery" to the buyer. Eventually, the shares must be bought back to close out the transaction. This technique is used when an investor believes the stock price will drop.
Short ratio(or short interest ratio)
Number of shares of a security that investors have sold short divided by average daily volume of the security (measured over 30 days or 90 days). There are various interpretations of this ratio. When people short, it is usually (but not always) because they are pessimistic about the security's future performance. Shorting involves buying at some point however. Hence, some would interpret a high short ratio as an indicator that there will be some buying pressure on the security that would increase its price.
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