Volatility
The extent to which an asset's price or returns vary over a specified period.
In more detail
Volatility describes movement, not its direction. A market with frequent large swings can have high measured volatility even if it eventually returns near its starting price. The chosen period and calculation method affect the number, and past swings do not specify the next move.
How you might use it
"Green, red, green again. My chart has had a very busy week." Those large swings produce high observed volatility for that period.
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