The PRESIDENT'S CUP
Why President's? Japan doesn't have a President- a constitutional Monarchy. They have Emperors.
ALL sporting trophies there are called Emperor's Trophy' except this one, this time.
Significance?
POTUS has the CUP.
The HOLY GRAIL
PROOF it's NOT the President's Cup
from 2016:
If he could beat rival Harumafuji โ himself a winner of seven Grand Tournament championships โ Hakuho would win a record 36th Emperorโs Cup.
https://fivethirtyeight.com/features/the-sumo-matchup-centuries-in-the-making/