Well, I think circumflex itself doesn't have an antonym, but it means to bend around or curve, you can try and look up for a synonym for curve. It could be straighten/straight or line.
Do you mean a number line?The question you asked contains the answer. Every point on a number line corresponds to a number, and every number has a corresponding point on the number line.
By drawing the number line and label it.
The scale is the maximum of the total number line and is used to create the base of the question and number line.
4 is one of infinitely many points on a number line. There is not a special number line for 4!
The word straight does have an antonym, which is crooked. So perhaps a crooked line is the opposite of a straight line.
Atomic number hasn't an antonym.
a line ;)
Straight line
Antonym means the opposite. So the opposite of angle is a straight line.
whole number
Synonyms for array are display, arrangement, line up, or collection. Antonym is the opposite: disarray, random.
A curved line without a closed end
The lonliest number, one.
half FractionHalf mixed
the number 4
Can't really say there is an antonym for numbers but in my opinion, 4 or 16 is likely to be a number that can go against 8.