ISO 3098-3:2000

Overview

ISO 3098-3:2000 - Technical product documentation - Lettering - Part 3: Greek alphabet - specifies the use of Greek letters as symbols in technical drawings and associated documents. Published as the second edition in 2000, this part of the ISO 3098 series focuses on consistent, legible rendering of Greek characters for stencilled, freehand or other appropriate lettering methods in technical product documentation.

Key topics and requirements

• Scope: Defines how the Greek alphabet is to be used as symbols in technical drawings and related documentation.
• Primary methods: Applies primarily to stencil lettering but is explicitly applicable to freehand and other lettering techniques.
• Reference to general rules: General character dimensions and overall lettering requirements are covered in ISO 3098-0:1997 (Part 0). ISO 3098-3 relies on those general requirements for height, stroke widths and spacing.
• Line quality and geometry: To achieve constant line density, avoid blotting at intersections, and facilitate writing, characters shall be formed so that lines cross or meet at approximate right angles.
• Illustrative examples: The standard provides examples for sloping and vertical lettering forms (including preferred applications), helping ensure consistent glyph shapes for Greek letters used in drawings.

Practical applications

Who uses ISO 3098-3 and why:

• Engineers and designers annotating technical drawings and schematics where Greek symbols (e.g., alpha, beta, gamma) denote parameters, coefficients or reference designators.
• Draftspersons and CAD operators implementing standardized lettering for consistency across manufacturing, assembly and inspection documents.
• Technical illustrators and documentation specialists producing manuals, part lists and assembly instructions requiring clear symbol typography.
• Quality assurance and standards compliance teams checking drawing legibility and conformance to international documentation practices.

Practical benefits:

• Improves legibility and reduces ambiguity when Greek symbols are used in engineering drawings.
• Promotes consistency across paper and CAD-produced documentation.
• Helps avoid printing and engraving artifacts (blotting, uneven stroke density) by prescribing geometric construction principles.

Related standards

• ISO 3098-0:1997 - General requirements for technical lettering
• ISO 3098-2 - Latin alphabet, numerals and marks (other parts of ISO 3098 series)
• ISO 3098-4, -5, -6 - Diacritical marks, CAD lettering, Cyrillic alphabet (other parts in the series)

Keywords: ISO 3098-3, Greek alphabet, lettering, technical product documentation, technical drawings, stencils, freehand lettering, CAD lettering, ISO 3098.