Abbreviations should be used sparingly.
Generally, abbreviations are formed by the initial letters of the word to which they correspond. Short forms must always end in a full stop:
see - confronted with
Sometimes, letters at the end of the word may appear next to the dot, in superscript:
Dr. - doctor
When it comes to the abbreviation of a string of words, a space is used between the abbreviated forms:
pls - please
In case the full form has an accent on the initial letters, the abbreviation will show the same:
If an abbreviation occurs at the end of a sentence, the period must not be repeated:
[…] etc. — and not […] etc.
To form the plural of an abbreviation, add an s or double the letter if the abbreviation is a single letter:
p./pp. - pages)
A./AA. — author(s)
In Latin or foreign abbreviations, the use of italics is not recommended:
etc — and so on