It is called a reflection.
The line above a letter in mathematics means a vector whose mane is the letter. So it is pronounced "vector a"
A location on a line is often called a point, or a place on the line.
a line. arrow on one end is called a ray and no arrows is called a line segment.
To flip a figure over a line is a reflection.
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.
The curved line over a short vowel is called a breve. It is used to indicate a short pronunciation of the vowel.
An accent.
The mark over a short vowel is called a breve. It is a diacritical mark used in various languages to indicate a short or light pronunciation of the vowel it is placed over.
The line over a letter in phonetics is called a "macron". It indicates a long vowel sound.
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.
A macron is the symbol that represents a long vowel sound. It is a line placed over a vowel to indicate that it is pronounced with a long sound.
a short vowel
The short vowel symbol is called a breve. It looks like a small curved line placed above a vowel letter.
long
Two dots over a vowel is normally called a dieresis. There is a special case of the dieresis in German where the two dots cause the vowel to change (sound and meaning): this special case is called umlaut.
The symbol for a long vowel sound is called a macron. It is a diacritical mark placed over a vowel to indicate that it is pronounced as a long vowel.