In technical analysis, majority of the patterns were first observed visually and then the rules made. Observing this interesting phenomenon on BNF over the past one month.
Any strong up day on BNF is immediately followed by a gap down open from the previous closing

Technical analysis of stock trends by Edwards and Magee
https://t.co/O8yWYpWC2W
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— Subhadip Nandy (@SubhadipNandy16) September 20, 2018
In financial mathematics, implied volatility of an option contract is
that value of the volatility of the underlying instrument which, when
input in an option pricing model ) will return a theoretical value equal to the current market price of the option (1/n)