Number, Other (No)

• Define a strict boundary for the gc-no filter to avoid false positives.
• Document provenance for each code point and keep source references up to date.
• Provide clear fallback behavior when a code point lacks a category or is unknown.
• Offer accessible labels and sensible descriptions for UI presentation and screen readers.
• Test across fonts and rendering environments to ensure consistent behavior.

The gc-no category covers code points whose General_Category is No. It is useful for filtering and data validation where certain characters should be treated as excluded or special cases in text processing.

Typical usage includes input validation, normalization, and pipeline guards in multilingual apps. Pitfalls include reclassifications over time, edge cases with combining marks, and reliance on outdated tooling. Rely on stable, well-maintained resources and implement regular updates. Historical context: categorical tagging of characters evolved to support predictable text handling across platforms, languages, and scripts, enabling developers to reason about character behavior beyond individual glyphs.

Related categories can inform broader strategies: Currency Symbols, Geometric Shapes Block, Arrows Block.