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Helium is a functional programming language for verifying properties of digital designs. The language is based on first-order logic and uses a combination of boolean, arithmetic, and verification operators to construct abstract models of hardware components or systems. Verification engineers use Helium to define safety and correctness properties that need to be upheld by the design. Once the properties are encoded in Helium code, dedicated tools can automatically check them against the design's description, providing feedback on whether it meets those specifications or not. This process can help catch errors early in the hardware development cycle before committing resources to prototyping or production.