Just as the ampersand symbol (&) is a stylised abbreviation of the Latin word "et" (meaning "and"), the crossed R is thought to be a stylised abbreviation of the Latin word "Recipe".
This is the imperative form of the verb "recipere" so literally means "Take..." https://en.wikipedia.org/wiki/Medical_prescription
Jun 02 2011, 6:59 PM
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gmackematix 20 year member
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I knew stopping to get a cup of tea in the middle of answering was a bad idea. And the two sugars I had in it are probably not what the doctor (or dentist) ordered.