Regular Space Characters
U+0020 SPACE
This is the regular space character as produced by pressing the space bar of your keyboard.
U+00A0 NO-BREAK SPACE
A fixed space that prevents an automatic line break at its position. Abbreviation: NBSP
U+2000 EN QUAD
A 1 en (= 1/2 em) wide space, where 1 em is the height of the current font.
U+2001 EM QUAD
A 1 em wide space, where 1 em is the height of the current font.
U+2002 EN SPACE
A 1 en (= 1/2 em) wide space, where 1 em is the height of the current font.
U+2003 EM SPACE
A 1 em wide space, where 1 em is the height of the current font.
U+2004 THREE-PER-EM SPACE
A 1/3 em wide space, where 1 em is the height of the current font. "Thick Space".
U+2005 FOUR-PER-EM SPACE
A 1/4 em wide space, where 1 em is the height of the current font. "Mid Space".
U+2006 SIX-PER-EM SPACE
A 1/6 em wide space, where 1 em is the height of the current font.
U+2007 FIGURE SPACE
A space character that is as wide as fixed-width digits. Usually used when typesetting vertically aligned numbers.
U+2008 PUNCTUATION SPACE
A space character that is as wide as a perido (".").
U+2009 THIN SPACE
A 1/6 em - 1/4 em wide space, where 1 em is the height of the current font.
U+200A HAIR SPACE
Narrower than the "THIN SPACE", usually the thinnest space character.
U+202F NARROW NO-BREAK SPACE
A narrow form of a no-break space, typically the width of a "THIN SPACE". Abbreviation: NNBSP.
U+205F MEDIUM MATHEMATICAL SPACE
A 4/18 em wide space, where 1 em is the height of the current font. Usually used when typesetting mathematical formulas.
U+3000 IDEOGRAPHIC SPACE
Regular Space Characters with Zero Width
U+200B ZERO WIDTH SPACE
Literally a zero-width space character.
U+200C ZERO WIDTH NON-JOINER
When placed between two characters that would otherwise be connected into a ligature, a ZWNJ causes them to be printed in their final and initial forms, respectively.
U+200D ZERO WIDTH JOINER
When placed between two characters that would otherwise not be connected, a ZWJ causes them to be printed in their connected forms (ligature). Also used to join emoji with modifier characters.
U+2060 WORD JOINER
A zero width non-breaking space. Abbreviation: WJ.
U+FEFF ZERO WIDTH NO-BREAK SPACE
The zero width no-break space (ZWNBSP) is a deprecated use of the Unicode character at code point U+FEFF. Character U+FEFF is intended for use as a Byte Order Mark (BOM) at the start of a file. However, if encountered elsewhere, it should, according to Unicode, be treated as a "zero width no-break space". The deliberate use of U+FEFF for this purpose is deprecated as of Unicode 3.2, with the word joiner strongly preferred.
Non-Space Characters that Act Like Spaces
The following characters are probably the most interesting: they act like regular space characters, but are typically not considered as such. Because of this, they can often be used in places where a single (regular) space character is not allowed (e.g. as a Youtube video title, in nick names in popular games, etc.).
U+180E MONGOLIAN VOWEL SEPARATOR
The MVS is a word-internal thin whitespace that may occur only before the word-final vowels U+1820 MONGOLIAN LETTER A and U+1821 MONGOLIAN LETTER E. It determines the specific form of the character preceding it, selects a special variant shape of these vowels, and produces a small gap within the word. It is no longer classified as space character (i.e. in Zs category) in Unicode 6.3.0, even though it was in previous versions of the standard.
U+2800 BRAILLE PATTERN BLANK
The Braille pattern "dots-0", also called a "blank Braille pattern", is a 6-dot or 8-dot braille cell with no dots raised. It is represented by the Unicode code point U+2800, and in Braille ASCII with a space. In all Braille systems, the Braille pattern dots-0 is used to represent a space or the lack of content. In particular some fonts display the character as a fixed-width blank. However, the Unicode standard explicitly states that it does not act as a space.
U+3164 HANGUL FILLER
The Hangul Filler character is used to introduce eight-byte Hangul composition sequences and to stand in for an absent element (usually an empty final) in such a sequence. Unicode includes the Wansung code Hangul Filler in the Hangul Compatibility Jamo block for round-trip compatibility, but uses its own system (with its own, differently used, filler characters) for composing Hangul.
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