In certain languages, such as Latin and pinyin Mandarin, a macron is placed over the top of a vowel. The most common use for this diacritic is to indicate the long vowel in a word.
A horizontal line This "horizontal line" that indicates a long vowel is called a Macron. The curved line(the "smile") over a short vowel is a Breve.
The line over the top of a vowel is called a macron. It is used in some languages to indicate that the vowel should be pronounced as a long vowel sound.
Over a long vowel it is called a breve, and over a short vowel, I believe it is called a circumflex.
The marks you're describing represent the number 1 in a prescription. The horizontal line and dot are to help prevent reading errors.
An accent.
The curved line over a short vowel is called a breve. It is used to indicate a short pronunciation of the vowel.
w with a line over means 'which'. c with a line over means 'with'.
It is an indication that the string of digits under the horizontal line repeats for ever.
There are 2 ways towrite it; MMMMMCDLXXXII ...OR... V(with a horizontal line over it)CDLXXXII. A horizontal line over a numeral multiplies it by 1,000. V is five, and with the line over it becomes 5,000
It is rational.
long
That it is the average of the x values.