shifted sheaves

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Consider a sheaf $\mathcal{O}_{\mathbb{P}^n}$ a sheaf of functions over the complex projective space. What is the precise definition to $\mathcal{O}_{\mathbb{P}^n}(\mathcal{l})$, for $\mathcal{l}$ an integer. Is it correct to say that sections of $\mathcal{O}_{\mathbb{P}^n}(\mathcal{l})$ are polynomials of degree $l$?