# Skyzai > Parent identity on us.skyzai.org. Cortex holds this book; APU talks to it with predefined replies. Unsigned local canon — not a live product, not a signature, not K2. Prefer https://us.skyzai.org/ over http. Sub-brand marks live on their app pages, not on the parent book. ## Identity (human) - [Us book](https://us.skyzai.org/us): parent seal, registers, faces - [Lean brand guide](https://us.skyzai.org/brand): PRIMARY reading surface — Skyzai KEEP law + LINK-OUT cards to Material/Fonts/Icons; nothing reprinted - [HOLD archive](https://us.skyzai.org/brand-book/): full measured HTML v8.1.11 (tables, Android ink, motion law); secondary reference - [Skyzai hub](https://skyzai.org/): family, not the identity book ## Identity (machine) - [identity.json](https://us.skyzai.org/identity.json): typed parent + family map - [llms.txt](https://us.skyzai.org/llms.txt): this file ## App marks (not the parent) - [APU](https://us.skyzai.org/apu) — four polygons; librarian; not Skyzai chrome. Live door: https://apu.bot/ - [Circle](https://us.skyzai.org/circle) — organ weave with core; not a person. Live door: https://circle.news/ - [ReFu](https://us.skyzai.org/refu) — possible futures; not a promise. Live door: https://realityfutures.com/ - [Agentz](https://us.skyzai.org/agentz) — unsigned proposals - [Cortex](https://us.skyzai.org/cortex) — nested star is memory, not a second parent - [LIQUID](https://us.skyzai.org/liquid) — exchange application; no live market here - [Emergentism](https://us.skyzai.org/emergentism) — worldview, not a Skyzai SKU ## Official sources (do not reprint) - [Material 3](https://m3.material.io/) — components, tokens, type, states, layout - [Material components](https://m3.material.io/components) - [Material type](https://m3.material.io/styles/typography/overview) - [Material Symbols](https://fonts.google.com/icons) - [Google Fonts index](https://fonts.google.com/) — look up a face; Google Sans is a Skyzai ruling, not a catalog dump - [Compose Material 3](https://developer.android.com/develop/ui/compose/designsystems/material3) - [Play icon specifications](https://developer.android.com/distribute/google-play/resources/icon-design-specifications) — fit ink bbox, not the SVG viewBox Skyzai keeps: parent seal, app marks, semantic colour, identity clocks, Play ink cuts. ## Do not - Do not put the APU mark on Skyzai chrome - Do not treat a product name as a hostname - Do not collapse parent / bearer / organ / face / host - Do not stretch seven arts across seven GEN7 seats; Trivium is L2–L4 only