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The [[ISO/IEC 8859]] series of encodings conforms to [[ISO/IEC 4873]] (ECMA-43) level 1, a subset of ISO/IEC 2022 designed for 8-bit character encodings, and therefore designates the range 0x80–0x9F for use by a C1 control code set such as ISO/IEC 6429. Unicode inherits its [[Basic Latin (Unicode block)|first]] and [[Latin-1 Supplement (Unicode block)|second]] blocks (comprising U+0000 through U+00FF) from ASCII and [[ISO/IEC 8859-1]], thus incorporating the C0 and C1 control code ranges (U+0000–U+001F, U+007F–U+009F).
Category "Cc" control codes serve a variety of purposes, not limited to format effectors: for example, the default ASCII C0 set includes six format effectors ({{ctrl|BS}}, {{ctrl|HT}}, {{ctrl|LF}}, {{ctrl|VT}}, {{ctrl|FF}} and {{ctrl|CR}}), ten transmission controls, four device controls, four information separators and eight other control codes.<ref name="ir001">{{citation|mode=cs1 |author=ISO/TC 97/SC 2 |author-link=ISO/IEC JTC 1/SC 2#History |title=The set of control characters of the ISO 646 |date=1975 |publisher=ITSCJ/[[Information Processing Society of Japan|IPSJ]] |id=ISO-IR-1 |url=https://www.itscj.ipsj.or.jp/iso-ir/001.pdf}}</ref> Most of these characters play no explicit role in Unicode text handling, and are used only by higher-level protocols such as those used by [[terminal emulator]]s. Certain characters are commonly used for formatting or sentinel purposes:
Most of these characters play no explicit role in Unicode text handling, and are used only by higher-level protocols such as those used by [[terminal emulator]]s. The characters {{unichar|0000|note=NUL}}, {{unichar|0009|Horizontal tabulation|nlink=tab key|note=HT}}, {{unichar|000A|Line feed|nlink=newline|note=LF}}, {{unichar|000D|carriage return|note=CR}}, and {{unichar|0085|NEL|note=NEL}} are commonly used in text processing as formatting characters. Unicode only specifies semantics for U+0009—U+000D, U+001C—U+001F, and U+0085. The rest of the control characters are transparent to Unicode and their meanings are left to higher-level protocols, although interpretation as defined in ISO/IEC 6429 is suggested as a default.<ref name="unicode-23-1">{{cite book |url=https://www.unicode.org/versions/Unicode12.0.0/ch23.pdf#page=3 |title=23.1: Control Codes |work=The Unicode Standard |edition=12.0.0 |date=2019 |author=Unicode Consortium |author-link=Unicode Consortium |isbn=978-1-936213-22-1 |pages=868–870}}</ref> Furthermore, certain specialised higher-level protocols, such as transcoded [[Teletext]], may include a [[Teletext character set#Control characters|different interpretation]] of the entire C0 control code range.<ref>{{cite web |url=https://corp.unicode.org/pipermail/unicode/2020-October/009120.html |title=Teletext separated mosaic graphics |work=Unicode Mailing List Archive |last=Ewell |first=Doug |date=2020-10-16 |publisher=[[Unicode Consortium]] |quotation=I reiterate that it was UTC {{bracket|[[Unicode Technical Committee]]}} and Script Ad Hoc who provided the guidance to the group writing the [[Symbols for Legacy Computing]] proposal (and there is a second on the way) that 0x00 through 0x1F in the original teletext set should map to U+0000 through U+001F when converting to Unicode.}}</ref>▼
* {{unichar|0000||note=NUL: NULL}} (used in [[null-terminated string]]s)
* {{unichar|0009||note=HT: HORIZONTAL TABULATION}} (inserted by the [[tab key]])
* {{unichar|000A||note=LF: LINE FEED}} (used as a [[newline|line break]])
* {{unichar|000C||note=FF: FORM FEED}} (denotes a [[page break]] in a plain text file)
* {{unichar|000D||note=CR: CARRIAGE RETURN}} (used in some line-breaking conventions)
* {{unichar|0085||note=NEL: NEXT LINE}} (sometimes used as a line break in text transcoded from [[EBCDIC]])
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== Unicode introduced separators ==
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