Ø in Text Editor
00d8   ALT + x

Ø in Libre Office
00d8   ALT + c

Æ is 00c6
æ is 00e6
Ø is 00d8
ø is 00f8
Å is 00c5
å is 00e5

Norwegian letters … of course. It’s efficient to have those at hand, while learning the language plus a few other useful symbols and code tweaks.

' is 0027 simple apostrophe

| is 007c vertical bar

× is 00d7 multiplication cross 

∎ is 220e end of proof

nobreak is 2010 
<nobr> in HTML 

soft hyphen is 00ad 
&shy; in HTML