U+2170 "ⅰ" Small Roman Numeral One Unicode Character

U+2170 "ⅰ" Small Roman Numeral One is a typographic symbol representing the number one in the lowercase Roman numeral system, distinct from the standard uppercase "I". It is part of the Number Forms block, designed for compatibility and clarity in contexts where a distinct lowercase numeral is preferred, such as in formal outlines, clock faces, or historical documents. This character serves as the base unit in sequences like ⅰ, ⅱ, ⅲ, allowing for consistent representation of numeric values in a more compact or stylized form than using uppercase letters.

General Properties

Code Point	U+2170
Version Added	1.1
Name	Small Roman Numeral One
Block	Number Forms
General Category	Letter Number
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right
Decomposition Type	Compat
Decomposition Mapping	"i" U+0069 Latin Small Letter I

Encodings

HTML Decimal Encoding	ⅰ
HTML Hex Encoding	ⅰ
UTF-8 Encoding	0xE2 0x85 0xB0
UTF-16 Encoding	0x2170
UTF-32 Encoding	0x00002170
C/C++/Java Escape	\u2170

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
Numeric Type	Numeric
Numeric Value	1
Line Break	Ambiguous (Alphabetic or Ideographic)
East Asian Width	Ambiguous
Lowercase	Yes
Other Lowercase	Yes
Simple Uppercase Code Point	"Ⅰ" U+2160 Roman Numeral One
Simple Titlecase Code Point	"Ⅰ" U+2160 Roman Numeral One
Uppercase Code Point	"Ⅰ" U+2160 Roman Numeral One
Titlecase Code Point	"Ⅰ" U+2160 Roman Numeral One
Cased	Yes
Changes When Casemapped	Yes
Changes When NFKC Casefolded	Yes
Changes When Titlecased	Yes
Changes When Uppercased	Yes
NFKC Casefold	"i" U+0069 Latin Small Letter I
NFKC Simple Casefold	"i" U+0069 Latin Small Letter I
Script	Latin
Script Extensions	Latin
Indic Syllabic Category	Other
ID Start	Yes
XID Start	Yes
ID Continue	Yes
XID Continue	Yes
Alphabetic	Yes
Vertical Orientation	Upright
Grapheme Base	Yes
Grapheme Cluster Break	Other
Word Break	Alphabetic letter
Sentence Break	Lower