Some letters look different when they appear at the end of a word.
In Greek, the sigma is the only example of this. It looks like σ in the middle of a word and ς at the end of a word.
In Hebrew, there are several letters that do this. video
A כ looks like ך when it is the last letter of a word.
A מ looks like ם when it is the last letter of a word.
A נ looks like ן when it is the last letter of a word.
A פ looks like ף when it is the last letter of a word.
A צ looks like ץ when it is the last letter of a word.
