Over a long vowel it is called a breve, and over a short vowel, I believe it is called a circumflex.
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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.
To flip a figure over a line is a reflection.
The line that crosses the y-axis is called the intercept.