In product marking small character means by definition small signs/symbols or graphics up to a certain font height. This description is mostly used in combination with marking instruments for example at small character inkjet printers.
These marking instruments are continuous inkjet printers , which print signs/symbols and graphics with font heights from 0.8 up to 16 mm.
Especially on small products with less space for the product marking, for example best before date, lot number or a barcode, small character inkjet printers are used. Small character inkjet coders generally print information that can be as little as a single line and as many as 5 lines.