System fallback typefaces Helvetica and Arial

Summary

A fallback-typeface page presenting the two approved system substitutes for DS Indigo, Helvetica and Arial, side by side as a light/dark split with full specimens.

Visual description

Standard guideline layout on white. The left column holds "System Fallbacks" and a paragraph explaining that Helvetica or Arial may be used only in emails and technical situations, never in designed materials. The right is one rounded panel split vertically into a cream left half and a deep-violet right half. The cream half shows "Helvetica" with a regular and a bold alphabet-and-numeral specimen in dark type under a thin lavender rule; the violet half mirrors it with "Arial" in white. Running header: "Typography / Weights / 46".

Key takeaway

Pairing the two fallbacks as a clean light/dark diptych gives each equal weight and shows both in their likely contexts at once. The strict caveat in the body keeps a permissive rule from being abused.

Reuse notes

A tidy way to document web-safe or system fallbacks in a brand guide that ships a custom typeface. The split-panel specimen is reusable for any "primary vs fallback" comparison. Always pair fallbacks with an explicit note on when they are and are not allowed.