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+: plus 加号；正号
“1+1”读作：one plus one
－: minus; negative 减号；负号
“2-1”读作：two minus one
“-3”读作：minus three或negative three
“2-(-3)”读作：two minus negative three
±: plus-minus sign 正负号
“±1” 读作：plus or minus one
×: multiplied by ; times 乘号
“2×3” 读作：two multiplied by three 或 two times three
÷: divided by 除号
“4÷2”读作：four divided by two
=: equals; is equal to 等于号
“1+1=2”读作：One plus one equals two.
或 One plus one is equal to two.
≠: is not equal to 不等于号
“a≠b”读作：a is not equal to b
≌: congruent to 全等（两个图形形状相同、大小相等）
“△ABC≌△DEF”读作：Triangle ABC is congruent to Triangle DEF.
≈: approximately equal to 约等于号
“3×3≈10” 读作：Three multiplied by three is approximately equal to ten.
<: is less than 小于号
“1<2”读作 One is less than two.
>: is greater than 大于号
“2>1”读作：Two is greater than one.
≮: is not less than 不小于号
“3≮2”读作：Three is not less than two.
≯: is not greater than 不大于号
“2≯4” 读作：Two is not greater than four.
≤: is less than or equal to 小于或等于号
“2≤3”读作：Two is less than or equal to three.
≥: is greater than or equal to 大于或等于号
“5≥4”读作：Five is greater than or equal to four.
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