# Logo — Unless design system

Identity

# Logo (mark)
  [Spec](/en/design/identity/logo/)[Construction](/en/design/identity/logo/construction/)[Usage](/en/design/identity/logo/usage/)[Download](/en/design/identity/logo/download/)
## A circle and a golden-ratio triangle

The Unless mark — every coordinate derived from a single radius **R** and the golden ratio **φ**. Pre-rendered to static SVGs and served as cacheable images. Two variants — one for light surfaces, one for dark.


Light · #629BF8 · for dark backgrounds
  ![](/assets/svg/icon-light.svg)

Dark · #3B82F6 · for light backgrounds
  ![](/assets/svg/icon-dark.svg)          [Iconography · Usage](/en/design/foundations/iconography/usage/)     [Logo (mark) · Construction](/en/design/identity/logo/construction/)