# Global identifiers (IDs)

Unique Quiver global identifiers (IDs) in the form of `$A` are automatically assigned to all Quiver cards when added to an analysis.

## Identify global IDs

Global ID values can be seen in various places across Quiver:

* Next to each card and plot in the [**Analysis contents**](../analysis-toolbars/index.md#analysis-contents-panel) panel.
* Next to each parameter in the [**Parameters**](../cards-parameters/index.md#the-parameters-panel) panel.
* For each card in the card's header and the editor panel.
* For each parameterized input value in the editor panel.
* In the legend of a time series chart for each time series plot.
* In the axis of a time series chart for each shared axis.

![Global IDs across various locations in Quiver.](../../../assets/3609309c91794d568f392bde101a09aa458bb2654b9471abe97c101e6c776a70.webp)

## Use global IDs

Global IDs are used in [formulas](../cards-formulas/index.md) and [Vega plot](../cards-vega-plot/index.md) configurations to reference data sources, such as time series plots, transform tables, charts, arrays, or scalar values. For example, you can reference a transform table with its global ID (such as `$B`) in the data section of a Vega plot. To reference specific columns in a transform table, use the syntax `$A.column_name`. Similarly, you can reference scalar values using the global ID of a numeric metric card (like `$C`).