The Sigma plugin is designed for users who need to perform calculations directly within Obsidian. With support for a wide variety of mathematical expressions, the plugin allows users to conduct complex operations, such as financial planning, tracking expenses, or conversions, within their notes. It includes features like hierarchical calculations, variable assignment, scientific functions, and customizable output formatting. The plugin also supports token simulation, automatic block-level totals, and exporting results in clean HTML tables. It's ideal for users who want a powerful calculation tool embedded in their note-taking workflow.