The following are common symbols and their meanings in senior one mathematics: 1. +(plus sign): indicates the addition of two numbers. 2.- (minus sign): indicates the subtraction of two numbers. 3.× (multiplication sign): It means that two numbers are multiplied. 4. (Division sign): One number is divided by another. 5.= (equal sign): It means that two numbers are equal. 6.\u003c (less than sign): indicates that this number is less than another number. 7.\u003e (greater than sign): indicates that this number is greater than another number. 8.≤ (less than or equal to sign): indicates that the number is less than or equal to another number. 9.≥ (greater than or equal to sign): indicates that this number is greater than or equal to another number. 10.√ (root number): indicates the prescription. 1 1.π(π): indicates the ratio of circumference to diameter of a circle. 12.θ (angle): indicates the size of the angle. 13.sin, cos, tan (sine, cosine, tangent): indicates trigonometric function. 14.∞ (infinity): indicates that the value tends to infinity. 15.∩ (intersection): indicates the elements shared by * * * in the set. 16.∨( union): represents the sum of all elements in the set. 17.？ (Contains): indicates that the set contains another set. 18.？ (Subset): indicates that one set is contained in another set. These symbols are the basic symbols necessary for senior one mathematics, and students should master their usage and significance skillfully.