When you're writing in script, there are fourletters of the alphabet that you can't complete in one stroke.
当你用连写体书写时,字母表里有4个字母你不能一笔写完。
《柯林斯英汉双解大词典》
2
There are two designations used for God. Yahweh, which is the sacred Tetragrammaton, it's written with fourletters in Hebrew, they don't include vowels.
上帝有两种称谓。耶和华是神圣的四字圣名,它由四个希伯来字母组成,它们不包括元音。
3
In the A, B, C, D and F grading system, the first fourletters are typically considered passing grades.