Parabolic Stock Movements

Often used to describe dramatic shifts in stock / market prices, both up and down. Even when examining pricing where a stock or index’s price moves more slowly over time on average, a "zoomed out” big picture view typically has some parabolic characteristics. Parabolic is a term often used when discussing market volatility.

Unforeseen / Extreme moves to the downside in the market are commonly referred to as Black Swan events.