0.25 zero(O, naught) point two five plus, positive plus or minus multiplied by, time divided by be equal be approximately equal to, approximately equals round brackets; parentheses square(angular) brackets braces equal to more than or equal to finity aps into xty bracket a plus b bracket closed a=b a equals b; a is equal to b; a is b a≠b a is not equal to b; a is not b a±b a plus or minus b a≈b a is approximately equal to b a>b a is greater than b a is much [far] greater than b a≥b a is greater than or equal to b a is less than b a<< b a is much less than b a≤b a is less than or equal to b a is perpendicular to b x→0 r approaches infinity ≡ a is identically equal to b; a is of identity to b angle ab a is parallel to b b the difference between a and b a∝b a varies directly as b r square; x squared; the square of x; the second power of x; x to second power x cube; x cubed; the cube of x; the third power of x; x to the third power