name of a Chinese emperor
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禹 is a rare kanji that refers specifically to the name of a legendary Chinese emperor. It has no clear standalone meaning beyond this historical name.
ceremony performed by a sorcerer to protect a noble setting out on a trip
The origin of 禹 is uncertain. It is an ancient character used as a proper name, and its component breakdown is not clearly established.
Think of 禹 as a pictogram of a legendary figure, with the top stroke suggesting a crown and the lower part a stylized body. Remember it as the emperor's name.
For ウ, imagine the emperor's name echoing through a long hallway: 'Uuu' — the sound cues ウ.