They save so much time as one does not have to write the whole word, phrase or sentence. They are useful if the persons who read the abbreviations know what they mean or stand for, like medical personnel take medical terminology to study abbreviations for medical terminology. or engineers study terms for engineering, etc.
Acknowledged, standard abbreviations are almost always acceptable. For example, how often do you see Mister in full, except as a joke? Obviously, private or local abbreviations should not be used except for purely private and/or local purposes.
Abbreviations are not acceptable in Scrabble.
Abbreviations are acceptable in an informal situation or when everyone knows what the abbreviations mean. For example, you could talk about NASA in any setting, but you wouldn't say LOL in a business meeting.
Abbreviations make writing things easier and faster.
Every trust should have its own list of recognised abbreviations. If it's not on the list - don't use it!
NO. Acronyms and abbreviations are not allowed. However, PI is acceptable (it's a mathematical constant and Greek letter).
Yes, you can use abbreviations in Bananagrams.
Abbreviations are acceptable in formal reports as long as the word was spelled out correctly initially, because the reader has been informed the meaning of the abbreviation. Using abbreviations cuts down on the length of the report without taking away from the message or meaning of it.
No, abbreviations are not allowed in Scrabble.
You are writing a business letter, you should be more formal.
Both EKG and ECG are acceptable abbreviations of echocardiogram. I personally use EKG because with the hard "K" sound it is less likely to be confused with EEG which stands for electroencephalogram
See the related link for common abbreviations.