Offer Price 

The price at which the seller is willing to sell at. 

Option 

The right, but not the obligation, to buy (‘call option’) or sell (‘put option’) a specific amount of a given stock, commodity, currency, or index at a specified price (the ‘strike price’) during a specified period. For the holder, the potential loss is limited to the price paid to acquire the option. When an option is not exercised, it expires. 

One Cancels the Other (OCO) Order 

An OCO Order lets you place a sell limit and sell stop order on the same stock at the same time. When either order is executed the other will automatically be cancelled.  

One Triggers the Other (OTO) Order 

An OTO Order is the opposite of an OCO Order, as it only puts on orders when the parent order is triggered. 

Out-of–Hours 

Refers to trading outside the main opening hours of major markets. 

More Information: 
https://oxsecurities.com.au/metatrader-cfd/trading-hours/  

Over the Counter (OTC) 

An over-the-counter (OTC) instrument is traded without going through an exchange. It is traded directly between two parties. 

Financial instruments such as currencies, stocks and commodities can be traded OTC, with no physical location and done electronically. 

OPEC 

Organization of the Petroleum Exporting Countries, a intergovernmental organisation of 14 oil-producing nations headquartered in Vienna, Austria. It coordinates petroleum policies of its member countries and runs as a cartel to reduce market competition with production ceilings.