# Limbs and wings One feature Hoon lacks: a context that isn't a first-class value. Hoon has no concept of scope, environment, etc. An expression has exactly one data source, the subject, a noun like any other. * [Limbs](/hoon/limbs/limb.md) - A limb is used to resolve to a piece of data in the subject. A wing is thus a resolution path into the subject. * [Wings](/hoon/limbs/wing.md) - In Hoon we use 'wings' to extract information from the subject. A wing is a list of limbs (including a trivial list of one limb). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.urbit.org/hoon/limbs.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.