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    ISO 3098


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    ISO 3098-0:1997(EN)Technical product documentation — Lettering — Part 0: General requirements

    ISO 3098-0 was created by Technical Committee ISO/TC 10, Technical drawings, product definition and related documentation, Subcommittee SC 1, Basic conventions.
    ISO 3098 consists of the following parts, under the general title Technical product documentation — Lettering:
    — Part 0: General requirements
    — Part 1: Currently used characters
    — Part 2: Greek characters
    — Part 3: Diacritical and particular marks for the Latin alphabet
    — Part 4: Cyrillic characters
    — Part 5: CAD lettering of the Latin alphabet, numerals and marks
    ISO 3098-0:1997 specifies the general requirements for lettering, in accordance with all other parts of this International Standard, to be used in technical product documentation (in particular on technical drawings).
    It includes basic conventions as well as rules for the application of lettering using the following techniques:
    a) Free-hand lettering
    b) Templates (see ISO 9178) and manual lettering instruments;
    c) Dry transfer systems;
    d) Numerically controlled lettering and draughting systems.
    For the purposes of this part of ISO 3098-0:1997, the following definitions apply.
    1. Central line
    Imaginary line in the middle of each line or line element which is a constitutive part of a graphic character set.
    2. Graphic character set
    Finite set of different graphic characters in a fixed type of lettering, including letters of a certain alphabet, numerals, diacritical marks, punctuation marks and additional graphical symbols, that is considered complete for a given purpose also mentioned in ISO 2382-4
    3. Lettering
    (1) Procedure of writing graphic characters taken from a graphic character set on a (technical) drawing carrier
    (2) The whole of the nongraphic information on a (technical) drawing carrier (text, instructions, dimensions, etc.).
    (3) The whole of the graphic characters of a graphic character set which can be used for transferring nongraphic information onto a (technical) drawing carrier.
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