TS EN ISO 3098-4

TS EN ISO 3098-4 addresses the diacritical and particular marks used with Latin-alphabet lettering in technical product documentation. Rather than defining the base alphabet itself, this part organizes the additional marks that accompany the characters shown in ISO 3098-2 so that technical text can be written consistently across languages.

Why diacritical and particular marks matter

In technical drawings, parts lists and product records, plain Latin letters are often not enough to represent language-specific spelling accurately. Diacritical marks change pronunciation or distinguish words, while particular marks capture established language forms that are not represented by the base letters alone. In general technical terms, these marks are essential for readable multilingual documentation, especially where names, notes and labels must remain unambiguous.

Language-based listing in the tables

According to the scope, the marks are listed in Tables 1 and 2 according to the various languages in which they are used. This provides a controlled reference for writing technical documentation in different language environments while keeping the presentation aligned with the lettering system of ISO 3098-2. The practical value is consistency: the same technical content can be rendered in a way that respects language conventions without losing clarity in engineering documents.

• The subject is the set of diacritical and particular marks used with the Latin alphabet.
• These marks are intended for use together with the characters shown in ISO 3098-2.
• They are organised in Tables 1 and 2 according to language use.
• The standard supports consistent lettering practice in technical product documentation.