Why these characters are risky:

Dot matrix and thermal inkjet printers create characters using patterns of dots. When dots are missing, faded, or misaligned, certain characters become nearly indistinguishable from each other. This is especially critical in pharmaceutical serialization where misread serial numbers can lead to product tracking failures, recalls, or supply chain disruptions. Additionally, OCR-B font is used to comply with industry standard infrastructure for camera recognition, where clear readability and visibility are necessary for reliable automated scanning.