Circuit Breaker
Refers to any of the measures used by stock exchanges during large sell-offs to avert panic selling. Sometimes called a "collar."

Investopedia Says:
After an index has fallen a certain percentage, the exchange might activate trading halts or restrictions on program trading. For example, if the Dow Jones Industrial Average falls by 10%, the NYSE might halt market trading for one hour. There are other circuit breakers for 20% and 30% falls.

Related Terms:
Black Monday
Collar
Panic Selling
Program Trading
Trade Resumption
Trading Curb
Trading Halt

• D
• Daily Average Revenue Trades (DARTs)
• Daily Average Revenue Trades (DARTs)
• Daily Chart
• Daily Cut-Off
• Daily Factor
• Daily Trading Limit
• Daisy Chain
• Dalal Street
• Dark Cloud Cover
• Dark Pool Liquidity
• Darvas Box Theory
• Data Mining
• Date Certain
• Dated Date
• Dawn Raid
• DAX
• Day-Around Order
• Day-Count Convention
• Day Order
• Days Payable Outstanding (DPO)
• Days Payable Outstanding (DPO)
• Days Sales Of Inventory (DSI)
• Days Sales Of Inventory (DSI)
• Days Sales Outstanding (DSO)