Brand identity v1 — public summary

This is a public summary of Yig Brand Identity — Design Spec v1, locked on 2026-05-07. The full internal spec carries implementation guidance and decisions that are not relevant outside the team. Everything here is durable and external-facing.

Foundation

Yig is a headless reasoning agent. The brand encodes three product truths:

1. Headless. The mark must read at terminal sizes, as IM avatars, and inside text rendering. There is no “splash screen” version.
2. One identity, every market. No regionally-specific motifs. One colour, one mark, one typeface.
3. Instrument, not lifestyle. Closer to Bloomberg / IBM than Notion / Linear. See Computer as instrument.

The mark — ∴

A logical therefore symbol: three equal-radius dots in an equilateral triangle.

• Native figure for a reasoning agent: premise → premise → ∴ conclusion.
• One primitive (the dot), one relation (equilateral). Bauhaus at its purest.
• Pre-existing Unicode codepoint U+2234 ∴ makes the mark ASCII-, IM-, and terminal-native.

The construction is mathematical. There is no optical adjustment. Equilateral means equilateral; pixel snapping is to integers; clearspace is asymmetric and intentional.

Colour

Role	Name	Hex	Usage
Primary	Ink · 墨	#0A0A0A	Mark default fill, body type, structural ink
Background	Paper · 纸	#FAF9F5	Page background. Warm off-white
Accent	Cinnabar · 朱砂	#C8321B	The single accent. CTAs, the i-dot, status emphasis
State only	Phosphor · 磷光	#00B85A	CLI / status indicators. Never on brand surfaces

The accent is rare on purpose. Approximate ink-area distribution on any clean brand surface is 90 / 8 / 1.5 / 0.5. If two cinnabar elements compete on one screen, one of them is wrong.

Typography

• Inter (SIL OFL) for everything content-side, weight 700 for headings and the Yig wordmark.
• The lowercase i-dot in the wordmark is replaced with a cinnabar disc. This is the only modification to the typeface. Everywhere else is system Inter.
• For Win98-themed surfaces, the chrome (titlebars, menubars) renders in Tahoma / MS Sans Serif via local fallback only; the content inside every window is still Inter.

Sub-product inheritance

Three sub-products fill the system. Each renders one dot of the mark in cinnabar, leaving the other two in ink.

Sub-product	Cinnabar dot position	Semantic
Yig (master)	None	Parent
Yig Thinker	Top vertex	The conclusion / reasoning apex
Yig Enterprise	Bottom-left vertex	Left foundation / institutional anchor
Yig Finance	Bottom-right vertex	Right foundation / quantitative anchor

A fourth sub-product cannot inherit by position alone. This is a feature: it forces the product line to stay focused.

Two layers, hard boundary

Yig has two visual layers that do not bleed into each other:

• The brand system (mark, wordmark, colour, type) is clean Swiss + Bauhaus, and renders identically across CLI, IM, PDF, slide deck, and docs.
• The Win98 chrome wraps the public marketing site only. Inside any Win98 window, the content (typography, code blocks, tables) reverts to the brand system. The chrome stops at the window border.

PDFs, business decks, and enterprise correspondence carry no Win98 chrome.

What you will not see

Five rules govern compliance and protect the brand from misreading as a Microsoft homage gone wrong:

1. No Microsoft Windows flag logo. The Start button is ∴.
2. No “Windows”, “Microsoft”, or “Win98” in UI labels.
3. No Microsoft system bitmaps. All pixel icons are self-drawn.
4. No bundled Microsoft fonts. Local fallback only, or self-host an OFL-licensed pixel font.
5. No Microsoft system sounds.

The marketing site footer carries the disclaimer required by line 1: Visual style inspired by Windows 98 (© Microsoft). Yig is not affiliated with Microsoft.

Where you will see Yig

The mark renders consistently across:

• The CLI banner (ASCII, ANSI 256-colour).
• IM avatars (Slack, Teams, Feishu) — ink circle, white mark, sub-product cinnabar dot.
• The favicon (16 × 16 px direct pixel rendering).
• Slide decks, PDFs, and enterprise correspondence (clean Swiss only — no chrome).
• The marketing site (clean Swiss content inside Win98 chrome).

The wordmark Yig carries the cinnabar i-dot anywhere it appears, including this article: Yig.