# Markings

Apply markings and configure their display symbols.

## API Reference

Import from `nominal.core`.

Classes

| [`Marking`](https://dev.nominal.io/python/ref/generated/nominal.core.Marking.md#nominal.core.Marking "nominal.core.Marking") | A marking, restricting access to the data sources it is applied to. |
| --- | --- |
| [`Symbol`](https://dev.nominal.io/python/ref/generated/nominal.core.Symbol.md#nominal.core.Symbol "nominal.core.Symbol") | A symbol used to identify a resource in the Nominal app. |

Enumerations

| [`SymbolKind`](https://dev.nominal.io/python/ref/generated/nominal.core.SymbolKind.md#nominal.core.SymbolKind "nominal.core.SymbolKind") | The kind of symbol carried by a [`Symbol`](https://dev.nominal.io/python/ref/generated/nominal.core.Symbol.md#nominal.core.Symbol "nominal.core.Symbol"). |
| --- | --- |