U+221D "∝" Proportional To Unicode Character
Unicode Version 17.0
∝
U+221D "∝" Proportional To is a mathematical symbol representing a proportional relationship between two quantities, signifying that one value changes in direct relation to another, typically expressed as "y ∝ x" meaning y is directly proportional to x. Originating from mathematical notation, it is often used in algebra, physics, and engineering to denote linear scaling without specifying a constant of proportionality. The symbol resembles an infinity sign (∞) but with one side truncated, emphasizing a direct correlation rather than an infinite bound. It is primarily employed in equations and formulas to indicate that as one variable increases or decreases, the other does the same by a constant factor.
General Properties
| Code Point | U+221D |
| Version Added | 1.1 |
| Name | Proportional To |
| Block | Mathematical Operators |
| General Category | Math Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Other Neutral |
| Mirrored | Yes |
Encodings
| HTML Decimal Encoding | ∝ |
| HTML Hex Encoding | ∝ |
| UTF-8 Encoding | 0xE2 0x88 0x9D |
| UTF-16 Encoding | 0x221D |
| UTF-32 Encoding | 0x0000221D |
| C/C++/Java Escape | \u221d |