add; plus; positive subtract; minus; negative multiply; times divide = equals is not equal to is approximately equal to < is less than > is greater than < is less than or equal to > is greater than or equal to $ dollar sign cent sign degree Celsius degree Fahrenheit angle parallelogram rectangle triangle line AB ray AB line segment AB vector AB perpendicular pi (approximately 3.1415926) is to (as in proportions such as a:b = c:d) repeating decimal 1.444. . . || parallel is congruent to (in figures) is congruent to (in numbers)