# Expression

An expression is a sequence of symbols following the [economic-space-protocol](https://glossary.ecsa.io/economic-space-protocol "mention") that is meaningful only within the scope of an [economic-space](https://glossary.ecsa.io/economic-space "mention"). Economic space expressions may refer to the resources contained in the scope from which it is evaluated and clearly and unambiguously describe the actions that you or other economic space agents may perform. These actions may include the creation of a new resource, an interaction with another [economic-space-agent](https://glossary.ecsa.io/economic-space-agent "mention"), alteration to the economic space record, or the invocation of another [protocol](https://glossary.ecsa.io/protocol "mention").