# Inscriptions [Ord](https://github.com/ordinals/ord)—open-source software that can run on top of any Bitcoin full node—was the technology originally used for such functionality. It allowed individual Satoshis (the smallest units of BTC) to be tracked, giving rise to the concept of “Ordinal Theory,” which ascribes a unique identifier to every single Satoshi on the Bitcoin network. Ordinal Theory is what allows users to "inscribe" arbitrary content onto individual Satoshis, transforming them into digital artifacts that can represent text, images, videos, and more. These Inscriptions came to be known simply as “Ordinals.” They are the epitome of Bitcoin-native digital assets and are thought of as Bitcoin’s version of NFTs (Non-Fungible Tokens). --- # 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://book.runesterminal.io/2.-origins/inscriptions.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.