Letter Spacing
Letter spacing serves different purposes at different sizes. Large text (headings, display) benefits from slightly negative letter spacing (-0.01em to -0.02em) because optical spacing at large sizes creates gaps that feel wider than intended. Small text (captions, labels, uppercase) benefits from positive letter spacing (+0.02em to +0.05em) because tight tracking at small sizes reduces legibility. A typography system defines these values once so they stay consistent across every component.
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Related terms
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Type Scale
A set of font sizes generated from a consistent mathematical ratio. Instead of picking sizes by feel, you pick a base size and a ratio, and every other size flows from that relationship.
Font Pairing
The strategic selection of two or more typefaces that work together in a design system. Good pairings create contrast in structure while maintaining harmony in proportion.