Priority Zero — the most-urgent possible bug or task. Drops everything; whoever is on it has authority to break process to fix it. Some companies use P1; Google and Meta use P0.
It's a P0 — pages everyone, nobody sleeps until it's fixed.
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The vocabulary of software engineers, AI researchers, and anyone living in a terminal or on GitHub — from LLM to MCP, CORS to vibe coding, agentic to enshittification.
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