Notation 6.3.3.6. Let $\operatorname{\mathcal{C}}$ be an $\infty $-category and let $W$ be a localizing collection of morphisms of $\operatorname{\mathcal{C}}$. We will often write $\operatorname{\mathcal{C}}[W^{-1}]$ for the full subcategory of $\operatorname{\mathcal{C}}$ spanned by the $W$-local objects. By virtue of Proposition 6.3.3.5, this is consistent with Remark 6.3.2.2: that is, we can regard $\operatorname{\mathcal{C}}[W^{-1}]$ as a localization of $\operatorname{\mathcal{C}}$ with respect to $W$. This convention is very convenient, since the full subcategory of $W$-local objects is uniquely determined by $\operatorname{\mathcal{C}}$ and $W$. However, it has the potential to create confusion in some situations: see Warning 6.3.3.8 below.

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