number line

noun Mathematics.
a straight line on which there is indicated a one-to-one correspondence between points on the line and the set of real numbers.
Also called real line.

1955–60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To number line
World English Dictionary
number line
an infinite line on which points represent the real numbers

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The number line comes from movement, crossing distances.
We humans seem to be born with a number line in our head.
Use graphing techniques on a number line to model both absolute value and
  arithmetic operations.
Irrationals have exact values, hence they have exact positions on the number
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