Significance and abbreviations
O is the fifteenth letter of the alphabet and the fourth vowel.
O is the human blood type of universal donors.
O is the chemical symbol of the element oxygen.
O’ as a prefix for a surname is the Irish abbreviation for “of the family”.
o’ stands for “of” in contractions such as “o’clock” and “man-o’-war”.
OK stands for okay and means that everything is all right.
OK is also the state postal code for Oklahoma, USA.
O levels (ordinary levels) was a level of secondary school examinations, part of the General Certificate of Education (GCE) in parts of the United Kingdom. It was replaced by the General Certificate of Secondary Education (GCSE) in 1988. O levels are the equivalent to Grade 10 in Canada.
ON is the official provincial postal code for Ontario, Canada.
O.R. or OR is…
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