Editing Katakana (section)

===Unicode===
{{Main|Katakana (Unicode block)|Halfwidth and Fullwidth Forms (Unicode block)|Enclosed CJK Letters and Months|l3=Enclosed CJK Letters and Months (Unicode block)|Katakana Phonetic Extensions|l4=Katakana Phonetic Extensions (Unicode block)|Kana Supplement|l5=Kana Supplement (Unicode block)|Small Kana Extension|l6=Small Kana Extension (Unicode block)|Kana Extended-A|l7=Kana Extended-A (Unicode block)|Kana Extended-B|l8=Kana Extended-B (Unicode block)|CJK Compatibility}}

Katakana was added to the Unicode Standard in October, 1991 with the release of version 1.0.

The Unicode block for (full-width) katakana is U+30A0–U+30FF.

Encoded in this block along with the katakana are the ''nakaguro'' word-separation [[middle dot]], the ''chōon'' vowel extender, the katakana [[iteration mark]]s, and a [[Typographic ligature|ligature]] of [[Koto (kana)|コト]] sometimes used in vertical writing.

{{unicode chart Katakana}}

Half-width equivalents to the usual full-width katakana also exist in Unicode. These are encoded within the [[Halfwidth and Fullwidth Forms]] block (U+FF00–U+FFEF) (which also includes full-width forms of Latin characters, for instance), starting at U+FF65 and ending at U+FF9F (characters U+FF61–U+FF64 are half-width punctuation marks). This block also includes the half-width dakuten and handakuten. The full-width versions of these characters are found in the Hiragana block.

{{Unicode chart Halfwidth and Fullwidth Forms|subset=katakana}}

Circled katakana are code points U+32D0–U+32FE in the Enclosed CJK Letters and Months block (U+3200–U+32FF). A circled ン (n) is not included.

{{Unicode chart Enclosed CJK Letters and Months|subset=katakana}}

Extensions to Katakana for phonetic transcription of Ainu and other languages were added to the Unicode standard in March 2002 with the release of version 3.2.

The Unicode block for Katakana Phonetic Extensions is U+31F0–U+31FF:

{{Unicode chart Katakana Phonetic Extensions}}

Historic and variant forms of Japanese kana characters were added to the Unicode standard in October 2010 with the release of version 6.0.

The Unicode block for Kana Supplement is U+1B000–U+1B0FF:

{{Unicode chart Kana Supplement}}

The Unicode block for Small Kana Extension is U+1B130–U+1B16F:

{{Unicode chart Small Kana Extension}}

The Kana Extended-A Unicode block is U+1B100–1B12F. It contains [[hentaigana]] (non-standard hiragana) and historic kana characters.
{{Unicode chart Kana Extended-A}}

The Kana Extended-B Unicode block is U+1AFF0–1AFFF. It contains kana originally created by Japanese linguists to write [[Taiwanese Hokkien]] known as [[Taiwanese kana]].
{{Unicode chart Kana Extended-B}}

The CJK Compatibility block contains in the range U+3330-3357 square versions of katakana words, usually measure units or abbreviations of loanwords:
{{Unicode chart CJK Compatibility|subset=katakana}}

Katakana in other Unicode blocks:
* [[Dakuten]] and [[dakuten|handakuten]] diacritics are located in the [[Hiragana (Unicode block)|Hiragana block]]:
** U+3099 COMBINING KATAKANA-HIRAGANA VOICED SOUND MARK (non-spacing dakuten): ゙
** U+309A COMBINING KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK (non-spacing handakuten): ゚
** U+309B KATAKANA-HIRAGANA VOICED SOUND MARK (spacing dakuten): ゛
** U+309C KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK (spacing handakuten): ゜
* Two katakana-based [[emoji]] are in the [[Enclosed Ideographic Supplement|Enclosed Ideographic Supplement block]]:
** U+1F201 SQUARED KATAKANA KOKO ('here' sign): 🈁
** U+1F202 SQUARED KATAKANA SA ('service' sign): 🈂
* A katakana-based Japanese TV symbol from the [[ARIB STD-B24]] standard is in the [[Enclosed Ideographic Supplement|Enclosed Ideographic Supplement block]]:
** U+1F213 SQUARED KATAKANA DE ('data broadcasting service linked with a main program' symbol): 🈓

Furthermore, as of Unicode {{Unicode version|version=16.0}}, the following combinatory sequences have been explicitly named, despite having no precomposed symbols in the katakana block. Font designers may want to optimize the display of these composed glyphs. Some of them are mostly used for writing the [[Ainu language]], the others are called {{ill|Dakuten#Phonetic shifts|lt=''bidakuon''|ja|鼻濁音}} in Japanese. Other, arbitrary combinations with U+309A handakuten are also possible.

{| class="wikitable nounderlines" style="border-collapse:collapse;background:#FFFFFF;font-size:large;text-align:center"
| colspan="17" style="background:#F8F8F8;font-size:small" | '''Katakana named sequences'''<br />[https://unicode.org/Public/UNIDATA/NamedSequences.txt Unicode Named Character Sequences Database]
|- style="background:#F8F8F8;font-size:small"
|| Sequence name || colspan="2" style="width:20pt"  | Codepoints || style="width:20pt"  | Glyph
|-
| style="text-align:left;font-size:small;"| KATAKANA LETTER BIDAKUON NGA || style="font-size:small;" | U+30AB || style="font-size:small;" | U+309A || カ゚
|-
| style="text-align:left;font-size:small;"| KATAKANA LETTER BIDAKUON NGI || style="font-size:small;" | U+30AD || style="font-size:small;" | U+309A || キ゚
|-
| style="text-align:left;font-size:small;"| KATAKANA LETTER BIDAKUON NGU || style="font-size:small;" | U+30AF || style="font-size:small;" | U+309A || ク゚
|-
| style="text-align:left;font-size:small;"| KATAKANA LETTER BIDAKUON NGE || style="font-size:small;" | U+30B1 || style="font-size:small;" | U+309A || ケ゚
|-
| style="text-align:left;font-size:small;"| KATAKANA LETTER BIDAKUON NGO || style="font-size:small;" | U+30B3 || style="font-size:small;" | U+309A || コ゚
|-
| style="text-align:left;font-size:small;"| KATAKANA LETTER AINU CE || style="font-size:small;" | U+30BB || style="font-size:small;" | U+309A || セ゚
|-
| style="text-align:left;font-size:small;"| KATAKANA LETTER AINU TU || style="font-size:small;" | U+30C4 || style="font-size:small;" | U+309A || ツ゚
|-
| style="text-align:left;font-size:small;"| KATAKANA LETTER AINU TO || style="font-size:small;" | U+30C8 || style="font-size:small;" | U+309A || ト゚
|-
| style="text-align:left;font-size:small;"| KATAKANA LETTER AINU P || style="font-size:small;" | U+31F7 || style="font-size:small;" | U+309A || ㇷ゚
|}