U+1D54 MODIFIER LETTER SMALL TOP HALF O
U+1D54 was added to Unicode in version 4.0 (2003). It belongs to the block 
This character is a Modifier Letter and is mainly used in the Latin script.
The glyph is a Super composition of the glyphs 
. It has a Neutral East Asian Width. In bidirectional context it acts as Left To Right and is not mirrored. In text U+1D54 behaves as Alphabetic regarding line breaks. It has
type Lower for sentence and ALetter for word breaks. The Grapheme Cluster Break is Any.
The Wikipedia has the following information about this codepoint:
Unicode has subscripted and superscripted versions of a number of characters including a full set of arabic numerals. These characters allow any polynomial, chemical and certain other equations to be represented in plain text without using any form of markup like HTML or TeX.
The World Wide Web Consortium and the Unicode Consortium have made recommendations on the choice between using markup and using superscript and subscript characters: "When used in mathematical context (MathML) it is recommended to consistently use style markup for superscripts and subscripts...However, when super and sub-scripts are to reflect semantic distinctions, it is easier to work with these meanings encoded in text rather than markup, for example, in phonetic or phonemic transcription."
Representations
| System | Representation |
|---|---|
| Nº | 7508 |
| UTF-8 | E1 B5 94 |
| UTF-16 | 1D 54 |
| UTF-32 | 00 00 1D 54 |
| URL-Quoted | %E1%B5%94 |
| HTML-Escape | ᵔ |
| Wrong windows-1252 Mojibake | áµ |
Elsewhere
Complete Record
| Property | Value |
|---|---|
| Age (age) | 4.0 |
| Unicode Name (na) | MODIFIER LETTER SMALL TOP HALF O |
| Unicode 1 Name (na1) | — |
| Block (blk) | Phonetic_Ext |
| General Category (gc) | Modifier Letter |
| Script (sc) | Latin |
| Bidirectional Category (bc) | Left To Right |
| Combining Class (ccc) | Not Reordered |
| Decomposition Type (dt) | Super |
| Decomposition Mapping (dm) |
|
| Lowercase (Lower) | ✔ |
| Simple Lowercase Mapping (slc) |
 |
| Lowercase Mapping (lc) |
|
| Uppercase (Upper) | ✘ |
| Simple Uppercase Mapping (suc) |
|
| Uppercase Mapping (uc) |
|
| Simple Titlecase Mapping (stc) |
|
| Titlecase Mapping (tc) |
|
| Case Folding (cf) |
|
| ASCII Hex Digit (AHex) | ✘ |
| Alphabetic (Alpha) | ✔ |
| Bidi Control (Bidi_C) | ✘ |
| Bidi Mirrored (Bidi_M) | ✘ |
| Bidi Paired Bracket (bpb) |
|
| Bidi Paired Bracket Type (bpt) | None |
| Cased (Cased) | ✔ |
| Composition Exclusion (CE) | ✘ |
| Case Ignorable (CI) | ✔ |
| Full Composition Exclusion (Comp_Ex) | ✘ |
| Changes When Casefolded (CWCF) | ✘ |
| Changes When Casemapped (CWCM) | ✘ |
| Changes When NFKC Casefolded (CWKCF) | ✔ |
| Changes When Lowercased (CWL) | ✘ |
| Changes When Titlecased (CWT) | ✘ |
| Changes When Uppercased (CWU) | ✘ |
| Dash (Dash) | ✘ |
| Deprecated (Dep) | ✘ |
| Default Ignorable Code Point (DI) | ✘ |
| Diacritic (Dia) | ✔ |
| East Asian Width (ea) | Neutral |
| Extender (Ext) | ✘ |
| FC NFKC Closure (FC_NFKC) |
|
| Grapheme Cluster Break (GCB) | Any |
| Grapheme Base (Gr_Base) | ✔ |
| Grapheme Extend (Gr_Ext) | ✘ |
| Grapheme Link (Gr_Link) | ✘ |
| Hex Digit (Hex) | ✘ |
| Hangul Syllable Type (hst) | Not Applicable |
| Hyphen (Hyphen) | ✘ |
| ID Continue (IDC) | ✔ |
| Ideographic (Ideo) | ✘ |
| ID Start (IDS) | ✔ |
| IDS Binary Operator (IDSB) | ✘ |
| IDS Trinary Operator and (IDST) | ✘ |
| InMC (InMC) | — |
| Indic Positional Category (InPC) | NA |
| Indic Syllabic Category (InSC) | Other |
| ISO 10646 Comment (isc) | — |
| Joining Group (jg) | No_Joining_Group |
| Join Control (Join_C) | ✘ |
| Jamo Short Name (JSN) | — |
| Joining Type (jt) | Non Joining |
| Line Break (lb) | Alphabetic |
| Logical Order Exception (LOE) | ✘ |
| Math (Math) | ✘ |
| Noncharacter Code Point (NChar) | ✘ |
| NFC Quick Check (NFC_QC) | Yes |
| NFD Quick Check (NFD_QC) | Yes |
| NFKC Casefold (NFKC_CF) |
|
| NFKC Quick Check (NFKC_QC) | No |
| NFKD Quick Check (NFKD_QC) | No |
| Numeric Type (nt) | None |
| Numeric Value (nv) | NaN |
| Other Alphabetic (OAlpha) | ✘ |
| Other Default Ignorable Code Point (ODI) | ✘ |
| Other Grapheme Extend (OGr_Ext) | ✘ |
| Other ID Continue (OIDC) | ✘ |
| Other ID Start (OIDS) | ✘ |
| Other Lowercase (OLower) | ✔ |
| Other Math (OMath) | ✘ |
| Other Uppercase (OUpper) | ✘ |
| Pattern Syntax (Pat_Syn) | ✘ |
| Pattern White Space (Pat_WS) | ✘ |
| Quotation Mark (QMark) | ✘ |
| Radical (Radical) | ✘ |
| Sentence Break (SB) | Lower |
| Simple Case Folding (scf) |
|
| Script Extension (scx) | Latin |
| Soft Dotted (SD) | ✘ |
| STerm (STerm) | ✘ |
| Terminal Punctuation (Term) | ✘ |
| Unified Ideograph (UIdeo) | ✘ |
| Variation Selector (VS) | ✘ |
| Word Break (WB) | ALetter |
| White Space (WSpace) | ✘ |
| XID Continue (XIDC) | ✔ |
| XID Start (XIDS) | ✔ |
| Expands On NFC (XO_NFC) | ✘ |
| Expands On NFD (XO_NFD) | ✘ |
| Expands On NFKC (XO_NFKC) | ✘ |
| Expands On NFKD (XO_NFKD) | ✘ |