Things whose values do not change.
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A straight horizontal line is a line that goes sideways, often represented by the equation y=a where a is any real number.
The number 5000 can be represented by the numeral V with a horizontal bar placed above it or by the numeral [V]
The number 1000000 can be represented in Roman numerals by M with a horizontal bar placed above it or by [M]
A complex number can be thought of as a vector with two components, called the "real part" (usually represented on the horizontal axis), and the "imaginary part" (usually represented on the vertical axis). You can also express the complex number in polar form, that is, with a a length and an angle.
The number 8000 can be represented by the Roman numeral VIII with a horizontal bar placed above it or by the Roman numeral [VIII]