Asterisk Symbol Meaning On a Particular Paper

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hope you are all doing well.

I am currently reading an article about quadcopters and on dynamic equations there is an asterisk symbol operation which I do not understand.

I know that it does not represent cross product (as a different notation used for it). I do not think it represents convolution either (I might be wrong). I thought that it might be representing dot product. Can you help me with that?