U+2BD1 "⯑" Uncertainty Sign Unicode Character
Unicode Version 17.0
⯑
U+2BD1 "⯑" Uncertainty Sign is an abstract symbol introduced as part of the Miscellaneous Symbols and Arrows block, designed to represent ambiguity, indeterminacy, or unknown variables in contexts such as mathematics, logic, documentation, and user interface design. It consists of a central dot encircled by a broken or open ring, visually suggesting incomplete or probabilistic information rather than a definitive fixed value. As a relatively modern addition to the Unicode standard, its primary function is to serve as a concise typographic marker for uncertainty in technical fields like cartography for map legends, or in scientific notation where a stable or certain result cannot be asserted.
General Properties
| Code Point | U+2BD1 |
| Version Added | 7.0 |
| Name | Uncertainty Sign |
| Block | Miscellaneous Symbols and Arrows |
| General Category | Other Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Other Neutral |
Encodings
| HTML Decimal Encoding | ⯑ |
| HTML Hex Encoding | ⯑ |
| UTF-8 Encoding | 0xE2 0xAF 0x91 |
| UTF-16 Encoding | 0x2BD1 |
| UTF-32 Encoding | 0x00002BD1 |
| C/C++/Java Escape | \u2bd1 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| NFKC Quick Check | Yes |
| NFKD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Script | Common |
| Script Extensions | Common |
| Indic Syllabic Category | Other |
| Pattern Syntax | Yes |
| Vertical Orientation | Upright |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Other |
| Sentence Break | Other |