The two yuds
ב''ה The two yuds for Hashem's name refer the 10 mamaros the world is created with and the 10 commandments. Together they are 20 for kof - keter elyon,"Asara, asara ha'kaf"- 10 and 10 for the 'kaf'. These two yuds are also two levels of brit - covenant, hinted to by Yosef, when it says 'Va'yisem' (with two yuds) ba'aron be'mitzrayim.' -Sefer Eishel Avraham