Unborrowable stock is the stock that no one is willing to lend out to short-sellers. When shares in a company become unborrowable, the traditional means of short selling them is impossible.

Unofficial strike is union members seizing their work without endorsement from the union and that does not follow legal requirements for the strike. 

Uneconomic growth is economic growth that has negative effect on the society which can become a reason for overall quality of life reducing.

Upside is the potential increase in value, measured in money or percentage of an investment.

Unilateral transfer is a one-way transfer of financial instruments or property from one country to another. 

Unqualified opinion is an independent auditor's judgment on company's financial statements.

Unmatched book is an imbalance occurring when the maturity of bank's assets doesn’t match the maturity of its liabilities on the balance sheet.

An underweight portfolio is a portfolio which does not hold sufficient amount of a particular security when compared to the amount of that security held in underlying benchmark portfolio. 

Underperform is a term defining professional recommendation given when a stock is expected to do a little bit worse than the market return. 

Unrealized gain is a profit that only exists on paper and results from an investment. It is a position that is sold is going to bring profit. Gain becomes realized when position is sold.

Unseasoned security is s type of asset that hasn’t been in the market for too long and thus it is impossible to predict its future movements and behavior. There is no historic data which traders could rely on in order to predict the movements.

Unrestricted cash refers to the monetary assets which are not tied to anything and have no particular usage. It can be used for anything as it is not saved for anything in particular. Companies usually keep unrestricted cash in order to balance sheets.

U-Shaped recovery is a type of recession-recovery relations that form a U when the movements are placed un the chart. It can be seen in the charts that represent employment rate, GDP and output of the industry.

The USD is the abbreviation for the U.S. dollar in the world of currency trading. The international foreign exchange market, where dollars are traded for other currencies from around the world - also known as the forex market - is the largest financial market in the world, with a daily average volume of over $1 trillion.