"re:" followed by subject content.
There is no proper abbreviation for the word global. It is often symbolized by a letter G in acronyms. As far as an abbreviation goes, many people use Gl., but this is in no way a proper abbreviation.
there is no proper abbreviation for say but you can use: s. say. or sy.
The proper abbreviation for Sunday is Sun.
The accepted abbreviation is Depr.
there is no abbreviation
Mr. is the abbreviation for the proper noun Mister, a title. Proper nouns are always capitalized, as well as the abbreviation for a proper noun.
You can use St or Ste as proper abbreviations for street in the English language.
I
in.
The abbreviation for the word,"VERSION" is V.
Re means "regarding".
CC