I have seen this "exception to the exception" before. > When "u" makes the same sound as the "y" in "you," or "o" makes the same sound as "w" in "won," then a

I have seen this "exception to the exception" before. > When "u" makes the same sound as the "y" in "you," or "o" makes the same sound as "w" in "won," then a is used. The word-initial "y" sound ("unicorn") is a glide [j] phonetically, which has consonantal properties; consequently, it is treated as a consonant, requiring "a." - a union - a united front - a unicorn Source: https://owl.purdue.edu/owl/general_writing/grammar/articles_a_versus_an.html https://owl.purdue.edu/owl/general_writing/grammar/articles_...