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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
\AA: å and Å.
\ae
\AE: æ and Æ.
\dh
\DH: Icelandic 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
\DJ: Crossed 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
\IJ: ij and IJ (except somewhat closer together than appears here).
\l
\L: ł and Ł.
\ng
\NG: Lappish letter eng, also used in phonetics.
\o
\O: ø and Ø.
\oe
\OE: œ and Œ.
\ss
\SS: ß and SS.
\th
\TH: Icelandic letter thorn: þ and Þ. Not available with OT1 encoding, you need the fontenc package to select an alternate font encoding, such as T1.