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Glyph for U+33C8
Source: Noto CJK

U+33C8 Square Db

U+33C8 was added in Unicode version 1.1 in 1993. It belongs to the block U+3300 to U+33FF CJK Compatibility in the U+0000 to U+FFFF Basic Multilingual Plane.

This character is a Other Symbol and is commonly used, that is, in no specific script.

The glyph is a square composition of the glyphs Glyph for U+0064 Latin Small Letter D, Glyph for U+0042 Latin Capital Letter B. Its East Asian Width is wide. In bidirectional text it is written from left to right. When changing direction it is not mirrored. U+33C8 offers a line break opportunity at its position, except in some numeric contexts.

The Wikipedia has the following information about this codepoint:

The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of 101/10 (approximately 1.26) or root-power ratio of 101/20 (approximately 1.12).

The unit expresses a relative change or an absolute value. In the latter case, the numeric value expresses the ratio of a value to a fixed reference value; when used in this way, the unit symbol is often suffixed with letter codes that indicate the reference value. For example, for the reference value of 1 volt, a common suffix is "V" (e.g., "20 dBV").

Two principal types of scaling of the decibel are in common use. When expressing a power ratio, it is defined as ten times the logarithm with base 10. That is, a change in power by a factor of 10 corresponds to a 10 dB change in level. When expressing root-power quantities, a change in amplitude by a factor of 10 corresponds to a 20 dB change in level. The decibel scales differ by a factor of two, so that the related power and root-power levels change by the same value in linear systems, where power is proportional to the square of amplitude.

The definition of the decibel originated in the measurement of transmission loss and power in telephony of the early 20th century in the Bell System in the United States. The bel was named in honor of Alexander Graham Bell, but the bel is seldom used. Instead, the decibel is used for a wide variety of measurements in science and engineering, most prominently for sound power in acoustics, in electronics and control theory. In electronics, the gains of amplifiers, attenuation of signals, and signal-to-noise ratios are often expressed in decibels.

Representations

System Representation
13256
UTF-8 E3 8F 88
UTF-16 33 C8
UTF-32 00 00 33 C8
URL-Quoted %E3%8F%88
HTML hex reference ㏈
Wrong windows-1252 Mojibake ㏈
Encoding: CP949 (hex bytes) A7 BC
Encoding: EUC_KR (hex bytes) A7 BC
Encoding: GB18030 (hex bytes) 81 39 E9 37
Encoding: ISO2022_JP_2 (hex bytes) 1B 24 28 43 27 3C 1B 28 42
Encoding: ISO2022_KR (hex bytes) 1B 24 29 43 0E 27 3C 0F
Encoding: JOHAB (hex bytes) DC 4C
Adobe Glyph List dbsquare

Elsewhere

Complete Record

Property Value
Age (age) 1.1 (1993)
Unicode Name (na) SQUARE DB
Unicode 1 Name (na1) SQUARED DB
Block (blk) CJK Compatibility
General Category (gc) Other Symbol
Script (sc) Common
Bidirectional Category (bc) Left To Right
Combining Class (ccc) Not Reordered
Decomposition Type (dt) square
Decomposition Mapping (dm) Glyph for U+0064 Latin Small Letter D Glyph for U+0042 Latin Capital Letter B
Lowercase (Lower)
Simple Lowercase Mapping (slc) Glyph for U+33C8 Square Db
Lowercase Mapping (lc) Glyph for U+33C8 Square Db
Uppercase (Upper)
Simple Uppercase Mapping (suc) Glyph for U+33C8 Square Db
Uppercase Mapping (uc) Glyph for U+33C8 Square Db
Simple Titlecase Mapping (stc) Glyph for U+33C8 Square Db
Titlecase Mapping (tc) Glyph for U+33C8 Square Db
Case Folding (cf) Glyph for U+33C8 Square Db
ASCII Hex Digit (AHex)
Alphabetic (Alpha)
Bidi Control (Bidi_C)
Bidi Mirrored (Bidi_M)
Composition Exclusion (CE)
Case Ignorable (CI)
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)
Cased (Cased)
Full Composition Exclusion (Comp_Ex)
Default Ignorable Code Point (DI)
Dash (Dash)
Deprecated (Dep)
Diacritic (Dia)
Emoji Modifier Base (EBase)
Emoji Component (EComp)
Emoji Modifier (EMod)
Emoji Presentation (EPres)
Emoji (Emoji)
Extender (Ext)
Extended Pictographic (ExtPict)
FC NFKC Closure (FC_NFKC) Glyph for U+0064 Latin Small Letter D Glyph for U+0062 Latin Small Letter B
Grapheme Cluster Break (GCB) Any
Grapheme Base (Gr_Base)
Grapheme Extend (Gr_Ext)
Grapheme Link (Gr_Link)
Hex Digit (Hex)
Hyphen (Hyphen)
ID Continue (IDC)
ID Start (IDS)
IDS Binary Operator (IDSB)
IDS Trinary Operator and (IDST)
IDSU (IDSU) 0
ID_Compat_Math_Continue (ID_Compat_Math_Continue) 0
ID_Compat_Math_Start (ID_Compat_Math_Start) 0
Ideographic (Ideo)
InCB (InCB) None
Indic Mantra Category (InMC)
Indic Positional Category (InPC) NA
Indic Syllabic Category (InSC) Other
Jamo Short Name (JSN)
Join Control (Join_C)
Logical Order Exception (LOE)
Modifier Combining Mark (MCM)
Math (Math)
Noncharacter Code Point (NChar)
NFC Quick Check (NFC_QC) Yes
NFD Quick Check (NFD_QC) Yes
NFKC Casefold (NFKC_CF) Glyph for U+0064 Latin Small Letter D Glyph for U+0062 Latin Small Letter B
NFKC Quick Check (NFKC_QC) No
NFKC_SCF (NFKC_SCF) Glyph for U+0064 Latin Small Letter D Glyph for U+0062 Latin Small Letter B
NFKD Quick Check (NFKD_QC) No
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)
Prepended Concatenation Mark (PCM)
Pattern Syntax (Pat_Syn)
Pattern White Space (Pat_WS)
Quotation Mark (QMark)
Regional Indicator (RI)
Radical (Radical)
Sentence Break (SB) Other
Soft Dotted (SD)
Sentence Terminal (STerm)
Terminal Punctuation (Term)
Unified Ideograph (UIdeo)
Variation Selector (VS)
Word Break (WB) Other
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)
Bidi Paired Bracket (bpb) Glyph for U+33C8 Square Db
Bidi Paired Bracket Type (bpt) None
East Asian Width (ea) wide
Hangul Syllable Type (hst) Not Applicable
ISO 10646 Comment (isc)
Joining Group (jg) No_Joining_Group
Joining Type (jt) Non Joining
Line Break (lb) Ideographic
Numeric Type (nt) none
Numeric Value (nv) not a number
Simple Case Folding (scf) Glyph for U+33C8 Square Db
Script Extension (scx)
Vertical Orientation (vo) U