- Tefillin have to be black
- Lavud (two things are within less than three tefachim of each other, they are considered to be touching, and therefore contiguous)
- all the types of shiurim (measurements)
- orlah outside of Eretz Yisrael
... are just some of the many Halacha L'Moshe M'Sinai
Does a comprehensive list of what all the Halacha L'Moshe M'Sinai are exist?