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42 Is mathematical shorthand for, 4 * 4 = 16
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The shorthand symbol for "dear sir" is often abbreviated as "D.S." in business correspondence. However, the use of shorthand can vary, and in many cases, it's more common to simply write "Dear Sir" in full. In specific shorthand systems, such as Pitman or Gregg shorthand, there are unique symbols for these words, but these are not universally recognized.
I took Century 21 shorthand in high school. It is a form of shorthand, just like Gregg or Pittman, although each one is a little different.
With the use of computer, smartphone and tablets, shorthand is a thing of the past.