Punctuation-space definitions

(in dated typography) A space of non-variable width: ⊣ ⊢ equal to the width of a period (full stop) or comma, inserted after ⟨“⟩ or ⟨‘⟩ and before ⟨”⟩ or ⟨’⟩ (sometimes ⟨?⟩ or ⟨!⟩), unless a punctuation mark occurs there. It is Unicode character U+2008. When using X11 input method, the conventional key combination is Compose+Space+Period.

Many examples occur on page 204 of the 1837 New Sporting Magazine XIII.

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^ Character 'PUNCTUATION SPACE' (U+2008)
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Origin of punctuation-space

Used to give consistent presentation of quotation marks irrespective of comma or period placement.