The Spreadsheet Batch Renamer is an add-on that allows users to export data names from Blender to an external spreadsheet for editing, and then import the changes to batch rename items. It specifically supports the renaming of bones and shape keys. The tool includes a temporary rename feature, enabling users to revert to original names after modifications are made. This functionality is particularly useful for temporarily adjusting bone naming conventions to ensure compatibility with X-axis mirroring during rigging workflows.