Try

document.title = 'Home \u00bb site.com';

Generally you can look up your special character at a site like this and then, once you know the numeric code, you can construct a Unicode escape sequence in your JavaScript string. Here, that character is code 187, which is "bb" in hex. JavaScript Unicode escapes look like "\u" followed by 4 hex digits.

Answer from Pointy on Stack Overflow
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Toolstud
toolstud.io › web › charmap.php
HTML character: » = »
HTML-encoded: » Unicode codepoint: » Unicode hexadecimal: U+00BB · URL Encoded: » · Related characters: « • › • ” • ‹ • ’ • ⟩ • “ • „ • ‚ • ‏ · In HTML (and XML), there are 'character entity reference' that are used to represent non-ASCII characters.
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Quora
quora.com › What-is-raquo-in-HTML
What is raquo in HTML? - Quora
‘raquo’ is one of the HTML entities (perhaps, in fact, one of my favorites), special characters generated by HTML escape codes.
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Use HTML entities: &name; or &#number;. Examples: for , → for →, € for €.
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toolstud.io
toolstud.io › web › charmap.php
HTML character: » = »
What is the difference between HTML entities and Unicode?
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toolstud.io › web › charmap.php
HTML character: » = »
How do I use Greek letters in HTML?
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toolstud.io › web › charmap.php
HTML character: » = »
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W3Schools
w3schools.com › charsets › ref_html_entities_r.asp
HTML Entities
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
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Raquo
raquo.net › laquo
laquo encodings ★ raquo.net
Since 2005 this site was a single serving site for references to the unicode entity raquo, », along with some of the other members of the “quo” family. 15 (!!!) years later I still get emails telling me people find it useful, so hopefully this page will get picked up as the replacement reference for that content. « · html: « html: « uri: « ·
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GitHub
github.com › raquo › scala-dom-types
GitHub - raquo/scala-dom-types: Scala types for your library to represent HTML tags, attributes, properties and CSS styles
Scala types for your library to represent HTML tags, attributes, properties and CSS styles - raquo/scala-dom-types
Starred by 95 users
Forked by 27 users
Languages   Scala 100.0% | Scala 100.0%
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GitHub
gist.github.com › apisandipas › 8420699
HTML Entities map - The pseudo-element 'content' property doesnt accept normal (») style HTML entities. These variables below easy the pain of looking up the HEX codes...
HTML Entities map - The pseudo-element 'content' property doesnt accept normal (») style HTML entities. These variables below easy the pain of looking up the HEX codes... - _html...
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Johns Hopkins Public Health
webhelp.publichealth.jhu.edu › support › solutions › articles › 6000086802-what-are-html-entities-special-characters-
What are HTML Entities (Special Characters)? : BSPH Website Help Desk
December 11, 2015 - Character entities are used to display reserved characters in HTML. — (&mdash;) ’ (&rsquo;) ” (&rdquo;) ‘ (&lsquo;) “ (&ldquo;) « (&laquo;) » (&raquo;) > (&gt;) < (&lt;) → (&rarr;) More entity codes → · Did you find it helpful? Yes NoSend feedback ·
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Raquo
raquo.net › raquo
raquo encodings ★ raquo.net
Since 2005 this site was a single serving site for references to the unicode entity raquo, », along with some of the other members of the “quo” family. 15 (!!!) years later I still get emails telling me people find it useful, so hopefully this page will get picked up as the replacement reference for that content. » · html: &raquo; html: &#187; uri: » ·
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Raquo
raquo.net › lsaquo
lsaquo encodings ★ raquo.net
Since 2005 this site was a single serving site for references to the unicode entity raquo, », along with some of the other members of the “quo” family. 15 (!!!) years later I still get emails telling me people find it useful, so hopefully this page will get picked up as the replacement reference for that content. ‹ · html: &lsaquo; html: &#8249; uri: ‹
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W3Schools
w3schools.com › charsets › tryit.asp
W3Schools online HTML editor
The W3Schools online code editor allows you to edit code and view the result in your browser
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Grav Community Forum
discourse.getgrav.org › archive
The problem with the & laquo; & raquo; in the html tag (page title) - Archive - Grav Community Forum
February 1, 2016 - These html entities are converted to & amp;laquo; and & amp;raquo; How can I fix it?
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Raquo
raquo.net › rsaquo
rsaquo encodings ★ raquo.net
Since 2005 this site was a single serving site for references to the unicode entity raquo, », along with some of the other members of the “quo” family. 15 (!!!) years later I still get emails telling me people find it useful, so hopefully this page will get picked up as the replacement reference for that content. › · html: &rsaquo; html: &#8250; uri: ›