1.   Friday, though, was dominated by traders, closing out options and futures as part of the triple witching.

2.   Known as triple witching, such days can lead to large orders to buy and sell, making prices bounce erratically.

3.   Known as triple witching, such days can lead to large orders to buy and sell, making prices bounce around.

4.   Known as triple witching when all three types of contracts expire together, such days can lead to large orders to buy and sell, making prices bounce erratically.

5.   Still, investors had expected rapid changes in the market because of triple witching, which takes place on the third Friday of the last month of each quarter.

6.   Triple witching is the expiration of stock options, index options and stock index futures that sometimes roils an otherwise routine market.

7.   Triple witching is the quarterly expiration of contracts on stock options, index options, and index futures.

8.   Triple witching refers to the expiration of stock options and index futures contracts.

9.   Triple witching occurs on the third Friday of March, June, September and December.

10.   Analysts also noted that the expiration of stock futures and options Friday, a quarterly occurrence called triple witching, might be contributing to the downturn.