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Table F-2 Mathematical and Technical Character References

Symbol

Character Reference

Description

`

∧

Logical and

/

∠

Angle

≈

≈

Almost equal to

d

∩

Intersection

c

∪

Union

°

°

Degree sign

÷

÷

Division sign

≡

Identical to

;

"

∃

There exists

ƒ

ƒ

Function

5

∀

For all

½

½

Fraction one half

¼

¼

Fraction one quarter

¾

¾

Fraction three quarters

≥

≥

Greater-than or equal to

∞

&inin;

Infinity

∫

∫

Integral

H

∈

Element of

≤

≤

Less-than or equal to

µ

µ

Micro sign

=

∇

Backward difference

≠

≠

Not equal to

I

∋

Contains as a member

∂

∂

Partial differential

'

⊥

Perpendicular

;

±

Plus-minus sign

∏

n-ary product

P

r

∝

Proportional to

√

√

Square root

~

∼

Tilde

∑

∑

n-ary summation

[

∴

Therefore

Table F-3 Arrow Character References

Symbol

Character Reference

Description

T

↓

Downward arrow

4

↔

Left right arrow

d

←

Leftward arrow

S

→

Rightward arrow

c

↑

Upward arrow