GlossaryAI Visibility & GEO terms
Definitions of key terms in AI Visibility, Generative Engine Optimization (GEO), and how brands measure and optimize their presence in AI-generated answers.
AI Visibility
The degree to which a brand, product, or organization appears in AI-generated answers from platforms like ChatGPT, Perplexity, Google AI Overview, and Claude. AI Visibility is measured across multiple dimensions including citation frequency, sentiment, source attribution, and competitive positioning.
Generative Engine Optimization (GEO)
The practice of optimizing content, technical infrastructure, and external signals to increase a brand's visibility in AI-generated answers. GEO is a distinct discipline from SEO, though they complement each other.
AVI Score (AI Visibility Index)
A proprietary measurement framework developed by Nordic Branch that evaluates a brand's visibility in AI-generated answers on a scale of 0–100. The AVI Score is measured across five dimensions: Presence, Preference, Proof, Path-to-action, and Risk.
Entity Confidence
A measure of how clearly AI systems understand and recognize a brand as a distinct entity. Low entity confidence means AI classifies a brand as a niche provider rather than a market leader, reducing recommendation likelihood.
Source Footprint
The breadth and depth of a brand's presence in external sources that AI systems use for verification. A strong source footprint means the brand is frequently mentioned in credible, AI-indexed publications.
AI Overviews
Google's AI-generated summary that appears at the top of search results for many queries. AI Overviews synthesize information from multiple sources and present a direct answer. As of 2026, AI Overviews appear in approximately 48% of search results (BrightEdge).
Zero-Click Search
A search query where the user finds the answer directly in the search results without clicking through to any website. According to SparkToro (2025), 67% of all Google searches are zero-click.
AI Citation
When an AI system references, quotes, or links to a specific source in its generated answer. AI citations are the primary mechanism through which brands receive visibility and traffic from AI platforms.
SEO (Search Engine Optimization)
The practice of optimizing websites to rank higher in traditional search engine results pages (SERPs). While distinct from GEO, SEO remains important as it complements AI Visibility.
LLM (Large Language Model)
The AI models that power platforms like ChatGPT, Claude, Gemini, and Perplexity. LLMs generate human-like text responses based on patterns learned from training data and, increasingly, real-time web retrieval.
RAG (Retrieval-Augmented Generation)
A technique where AI models retrieve relevant documents from external sources before generating a response. RAG is the mechanism behind Perplexity's citations and Google AI Overview's source references.
Inconsistent AI Presence
A condition where AI platforms describe or include a brand differently across ChatGPT, Perplexity, Google AI Mode, and Claude. It is one of three structural GEO signals measured in the AVI Score framework.
AI Visibility Compounding
The phenomenon where brands that build strong AI signals early accumulate citation authority that becomes increasingly difficult for competitors to overcome. Similar to compound interest in finance.
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