There's a similar effect with the initials D R, M R or M S.
In Britain, including a dot after abbreviations is a bit dated — it's UK, USA, NASA, JG Smith Motors Ltd, Mr Jones etc. (American usage seems mixed; I sometimes see "USA" and "U.K." in the same sentence.)
That means "Dr Jones", "DR JONES" and "D R JONES" are particularly easy to confuse.
In Britain, including a dot after abbreviations is a bit dated — it's UK, USA, NASA, JG Smith Motors Ltd, Mr Jones etc. (American usage seems mixed; I sometimes see "USA" and "U.K." in the same sentence.)
That means "Dr Jones", "DR JONES" and "D R JONES" are particularly easy to confuse.