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2024年4月15日发(作者：webserver接口菜鸟教程)
常用数学符号英文对照
Basic math symbols
Symbol Symbol Name Meaning / definition Example
=
equals sign equality
5 = 2+3
5 is equal to 2+3
≠
not equal sign inequality
5 ≠ 4
5 is not equal to 4
≈
approximately
sin(0.01) ≈ 0.01,
equal
approximation
x ≈ y means x is approximately
equal to y
>
strict inequality greater than
5 > 4
5 is greater than 4
<
strict inequality less than
4 < 5
4 is less than 5
5 ≥ 4,
≥
inequality greater than or equal to
x ≥ y means x is greater than or
equal to y
4 ≤ 5,
≤
inequality less than or equal to
x ≤ y means x is greater than or
equal to y
( )
parentheses
calculate expression inside
first
2 × (3+5) = 16
[ ]
brackets
calculate expression inside
first
[(1+2)×(1+5)] = 18
+
plus sign addition
1 + 1 = 2
−
minus sign subtraction
2 − 1 = 1
±
plus - minus
both plus and minus
operations
3 ± 5 = 8 and -2
±
minus - plus
both minus and plus
operations
3 ± 5 = -2 and 8
*
asterisk multiplication
2 * 3 = 6
1
×
·
÷
/
–
times sign
multiplication dot
division sign /
obelus
division slash
multiplication
multiplication
2 × 3 = 6
2 · 3 = 6
6 ÷ 2 = 3
6 / 2 = 3
division
division
horizontal line division / fraction
remainder calculation
decimal point, decimal
separator
exponent
exponent
mod
modulo
7 mod 2 = 1
2.56 = 2+56/100
2
3
= 8
2 ^ 3
= 8
√9 = ±3
3
.
a
b
a^b
√a
3
4
period
power
caret
square root
cube root
fourth root
√a · √a = a
3
√a
√a
√a
√a ·
3
√a ·
3
√a = a
√
a ·
4
√a ·
4
√a ·
4
√a = a
√8 = 2
√16 = ±2
4
4
n
n-th root (radical)
percent
per-mille
for n=3,
n
√8 = 2
10% × 30 = 3
10‰ × 30 = 0.3
10ppm × 30 = 0.0003
10ppb × 30 = 3×10
-7
10ppt × 30 = 3×10
-10
%
‰
ppb
ppt
1% = 1/100
1‰ = 1/1000 = 0.1%
1ppm = 1/1000000
1ppb = 1/1000000000
1ppt = 10
-12
ppm
per-million
per-billion
per-trillion
Geometry symbols
Symbol Symbol Name Meaning / definition Example
∠
angle formed by two rays
∠ABC = 30°
measured
angle
ABC = 30°
spherical angle
right angle
AOB = 30°
α = 90°
∟
= 90°
2
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