short answers
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.
Density = Mass / Volume. So, to write it shorthand, you would write D = m / v.
Density = Mass / Volume. So, to write it shorthand, you would write D = m / v.
42 Is mathematical shorthand for, 4 * 4 = 16
"Ptf." is the shorthand for plaintiff.
The shorthand for hope is "HP."
The shorthand for schedule is "sched."
the shorthand for a angry face :@
The shorthand symbol for transfer is "→".
Q&A is already shorthand for "question and answer."
the shorthand for a crying face :'( Also, ='[ and ='( and :'[
The only shorthand symbol I can think of for 'of' is o/.
The shorthand symbol for 'different' is ≠ (not equal to).