Here are the basic LaTeX commands for inserting letters beyond A–Z that extend the Latin alphabet, used primarily in languages other than English.
\aa\AAå and Å.
\ae\AEæ and Æ.
\dh\DHIcelandic letter eth: ð and Ð. Not available with OT1 encoding, you need the fontenc package to select an alternate font encoding, such as T1.
\dj\DJCrossed d and D, a.k.a. capital and small letter d with stroke. Not available with OT1 encoding, you need the fontenc package to select an alternate font encoding, such as T1.
\ij\IJij and IJ (except somewhat closer together than appears here).
\l\Lł and Ł.
\ng\NGLappish letter eng, also used in phonetics.
\o\Oø and Ø.
\oe\OEœ and Œ.
\ss\SSß and SS.
\th\THIcelandic letter thorn: þ and Þ. Not available with OT1 encoding, you need the fontenc package to select an alternate font encoding, such as T1.
© 2007–2018 Karl Berry
Public Domain Software
http://latexref.xyz/Additional-Latin-letters.html