UnicodeCharactercom
Ⅰ
U+2160 · ROMAN NUMERAL ONE

Roman Numeral One

  • CodepointU+2160
  • NameROMAN NUMERAL ONE
  • Decimal8544
  • BlockNumber Forms (U+2150–U+218F)
  • Plane0 — Basic Multilingual Plane
  • ScriptLatin
  • CategoryNl — Letter Number
  • Unicode version1.1 (1993)
  • Bidi classL — Left-to-Right
  • Combining class0
  • East Asian widthA — Ambiguous
  • MirroredNo

About this character

U+2160 (Ⅰ) is ROMAN NUMERAL ONE, a letterlike number in the Number Forms block. It belongs to the Latin script. It was added in Unicode 1.1 (1993).

Its lowercase form is U+2170 ⅰ.

It is a compatibility variant of U+0049 I (compatibility decomposition <compat>). NFC and NFD leave it alone, but NFKC and NFKD replace it with U+0049 I. Search engines, identifier checks and username systems that apply NFKC will treat the two as the same text.

It has the numeric value 1.

Its East Asian Width is Ambiguous: it takes one column in Western contexts and two in East Asian legacy contexts, a common cause of misaligned tables in terminals.

How to type Ⅰ

§

Encodings & escapes

UTF-8 encoder →
UTF-8E2 85 A03 bytes
UTF-1621601 code unit
UTF-32000021604 bytes
HTML decimal&#8544;
HTML hex&#x2160;
CSS\2160in content: "…"
JavaScript\u2160
JSON\u2160
Python\u2160
Python\N{ROMAN NUMERAL ONE}by name
Java / C#\u2160
C / C++\u2160universal character name
Rust / Swift / PHP\u{2160}
Go\u2160
Ruby\u2160
Excel / Sheets=UNICHAR(8544)
URL-encoded%E2%85%A0percent-encoded UTF-8
§

Normalization forms

Normalizer →
NFCunchanged
NFDunchanged
NFKCU+0049 I
NFKDU+0049 I
§

Looks similar

Characters that Unicode’s security data (UTS #39 confusables) lists as visually confusable with this one. Useful for spotting lookalike spoofing in URLs and usernames.

U+00311Digit One U+0049ILatin Capital Letter I U+006ClLatin Small Letter L U+007C|Vertical Line U+0196ƖLatin Capital Letter Iota U+01C0ǀLatin Letter Dental Click U+0399ΙGreek Capital Letter Iota U+0406ІCyrillic Capital Letter Byelorussian-Ukrainian I U+04C0ӀCyrillic Letter Palochka U+05C0׀Hebrew Punctuation Paseq U+05D5וHebrew Letter Vav U+05DFןHebrew Letter Final Nun U+0627اArabic Letter Alef U+0661١Arabic-Indic Digit One U+06F1۱Extended Arabic-Indic Digit One U+16C1ᛁRunic Letter Isaz Is Iss I
§

Nearby in Number Forms

All in block →
U+215A⅚Vulgar Fraction Five Sixths U+215B⅛Vulgar Fraction One Eighth U+215C⅜Vulgar Fraction Three Eighths U+215D⅝Vulgar Fraction Five Eighths U+215E⅞Vulgar Fraction Seven Eighths U+215F⅟Fraction Numerator One U+2161ⅡRoman Numeral Two U+2162ⅢRoman Numeral Three U+2163ⅣRoman Numeral Four U+2164ⅤRoman Numeral Five U+2165ⅥRoman Numeral Six U+2166ⅦRoman Numeral Seven