The Morse code for the 26 letters of the English language and the digits, you can find everywhere, e.g. here on Wikipedia. All one-, two-, and three-symbol combinations are in use.
In the international alphabet all but four of the four-symbol combinations are used. They are:
The two or three first German letters are used in many other languages also, e.g. Swedish, Finnish, Turkish, Hungarian etc.
|-··-·||–||Ê (also /)||–||–||–||–|
There are also six-symbol combinations in Polish: Ź which is –⋅⋅-⋅ (ZN) and Ś which is ⋅⋅⋅-⋅⋅⋅ (SB). The German Wikipedia even lists a Morse code for the double S: ß, ⋅⋅⋅–⋅⋅ or SZ, but I believe two consecutive S’s work well or even better.
I recently asked on the Elecraft list if the K3 Morse decoder could support some of these letters, and I asked specifically about Ä/Æ, Ö/Ø, Å, and Ü. These are the four which are shown in the first figure in the upper right-hand corner of this post.