What is Macron?
1.
Represented as: ¯
A macron is usually put over a vowel to show that the sound should be longer. Rarely used in English as most English almost never uses accent modifiers like
Macrons: ¨¡ ¨© ¨± ¨¥ ¨ ¨µ ȳ
See
2.
A long bar placed over vowels in words from foreign languages, like Japanese.
I read an old history book and saw a macron over the 'o' in Hokkaido