What is the concept of symbol perpendicular to power and integral interval?

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I saw the $ E_n = \frac{1}{\pi} $$\int_{\bot \infty}^{\infty} \sqrt{\frac{1}{(t^2-1)^2}-{\frac{(n+1)^2 t^{2n}}{(t^{2n+2}-1)^2}}} dt$$ $ and $ a.v(t)= C^{\bot1/2}a.C^{1/2}v(t)$ and Similar formula in the 'How many zeros of a random polynomial are real?' article. I wonder what is this? why ${\bot} $ in the integral interval or in the power? I don't understand its meaning. Could you please explain or link to that What is the concept of symbol perpendicular to power and integral interval?