> ## Documentation Index > Fetch the complete documentation index at: https://docs.airelabs.com/llms.txt > Use this file to discover all available pages before exploring further. # Overview A single variable in the model—an input, output, or calculated value. A modular, nestable group of terms or other blocks used to represent subsystems, logic, or reusable structures. A specific configuration of your model that defines how blocks and assumptions combine to represent a particular outcome or future state. The top-level container for all related models, scenarios, and views tied to a real-world asset or initiative. A specific reference that explains where a value came from—like user input, test data, a paper, or past project; acts as a traceable footnote. Optional plain-text context attached to a term or block; used to clarify intent, usage, or background. A term flagged as a key result or KPI for analysis, comparison, or reporting. A techno-economic analysis that connects technical parameters to financial performance. Capital expenditures—upfront investment costs grouped by system or timeline. Operating expenses—recurring costs modeled over time, like energy, maintenance, or labor. Tailored views built by Aire's project success team that surface exactly what you need—designed around your workflow and stakeholders. A person with access to one or more projects; roles define what they can view or edit.