The phrase "Qgis Ustra Brr.2006" is highly specific and does not correspond to a known, general QGIS plugin, core feature, or widely documented public dataset.

It is very likely a reference to:

A Local or Internal Dataset: The combination of "Ustra," "Brr," and a year (2006) strongly suggests it is an acronym or a code for a local or project-specific geospatial dataset used in a particular organization, government agency, or university project that utilizes QGIS (an open-source Geographic Information System).

A specific Project File or Layer: It could be the file name or layer name within a QGIS project, where:

QGIS: The software used.

Ustra: Likely an acronym or a location name.

Brr: Could be an abbreiation for a specific governmental body, a data type (e.g., boundaries, roads, region), or a data provider.

2006: The year the data was collected, created, or the source material (like a census or survey) was published.