1.1 This specification specifies shape, size, spacing, and shading of letters and numerals to be used aboard ship.
1.2 Characters are of Five Types:
1.2.1 Type 1-Plain letters and numerals (16 units).
1.2.2 Type 2-Block letters and numerals (12 units).
1.2.3 Type 3-Type 2 characters with shading (shading-1 unit).
1.2.4 Type 4-Block letters (10 units) and numerals (12 units).
1.2.5 Type 5-Type 4 characters with shading (shading-1 unit).
1.3 This specification does not give location or size of various shipboard markings incorporating letters and numerals.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM F906-85(2024) History
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