I remember some years ago when I started SMS’ing I had an old mobile phone that defaulted the text in upper case. After I while my son answered back: “Why are you always yelling at me in SMSes”.
So I learned that you can use lower case in SMSes as well, and only using all caps in SMSes, as in any other writing, usually means that YOU ARE YELLING.
Examining a text for upper case use can, together with polarity classifiers and all that jazz, be used today in sentiment analysis for example within social media data.
Within data parsing using words in upper case in person names may tell you something too. Especially in France it is common to indicate a surname with only upper case characters, so for example in the name “AUGUST Michel” the first name is the surname and the last name is the given name.
When matching company names a word in upper case may indicate an abbreviation. So “THE Ltd” and “The Happy Entrepreneur Ltd” may be a good match despite of a horrible edit distance.
In data migration within handling names from older systems where all caps have been used, it is common to try to make better looking names. “JOHN SMITH” will be “John Smith” and “SAM MCCLOUD” should be “Sam McCloud”. In environments with other alphabets than English national characters may be reintroduced as well. For example in a German context “JURGEN VON LOW” may come out as “Jürgen von Löw”.
What about you? Have you stumbled upon some fun with upper case in data management?