The logo, the mark, the palette, and the rules for using them. The marks and rasters live in brand/; the logo itself is in docs/images/ because the README and this site use it. The Hill has its own package in the same layout (the Hill's branding page), drawn as a variation on this one.

Tux in a field cap with the circle-A, a mobile rig showing 144.390, a handheld, a ruggedised laptop with a topographic map, a lattice mast, and a stack of manuals labelled radio, mapping, repeaters, EMCOMM, Linux and offline, in front of a sunset over mountains. The penguin is the author's own mark and is meant to be there. Drawn by the maintainer, 2026-10-05.

File	Use
docs/images/logo.png	720 px, transparent. The primary logo: README, this site, the org profile.
docs/images/logo-256.png	256 px, for anywhere the full file is wasteful.
brand/logo-1254.png	The artwork as delivered, 1254 px. Everything else is derived from it; re-derive from here, never from a derived file.

Used at 16 to 48 px as the favicon and the site's header icon. It is the compass rose from the logo's own base, set in the sunset disc.

File	Use
brand/mark.svg	Three colours on the ink disc, for dark grounds. Also served as docs/images/mark.svg.
brand/mark-light.svg	The same geometry on the purple disc, for light grounds.
brand/mark-mono.svg	One colour, inherited through currentColor. Screen printing, vinyl, laser, embroidery.
brand/favicon-{16,32,48}.png, brand/apple-touch-icon.png, brand/icon-512.png	Rasterised from mark.svg by headless Chromium, then optipng.
brand/social-preview.png	1280 by 640, the logo on the ink colour, for GitHub's repository social preview.

It is not a shrunk logo. At 16 px the full illustration is mud; a mark that works small is a different drawing with the same identity. Two things found by rendering rather than reasoning:

• The variants share their path data. tests/test_brand.py asserts that the light and mono marks reuse mark.svg's paths, so none of them can drift.
• mark-mono.svg draws in currentColor, so it is for inlining. Loaded through an <img> tag it renders black, because an SVG referenced that way is an isolated document that cannot see the page around it.

Published as brand/palette.json. Every value is sampled from the artwork, not chosen beside it.

Token	Hex
brand	#972883	The sunset purple.
brand-ink	#f99412	The amber.
brand-deep	#280423	The aubergine ink every line is drawn in; the ground the mark and the social preview sit on.
paper	#faedd6	The cream of the lettering.

The Hill's palette measures #912795, #ed9a1c and #481050 from its own artwork. The family is the shared hue; each repository publishes what its artwork measures, and a new colour goes into that repository's palette file, never beside it.

• Keep clear space around the mark of at least a quarter of its width.
• Do not recolour it outside the palette; use mark-mono.svg when you have one ink.
• Do not set type in the logo's lettering style beside it; the logo carries its own name.
• The logo and the marks are CC0-1.0, like the catalog (D-023): they are data about the project, and a downstream that carries the catalog may carry the mark that goes with it.
• A new repository in the suite gets the same package in the same layout, with its own variation on the logo, and a line in its own BRANDING.md saying what it varied.