The letter "Tariffs" word aligns with the current theme which runs from April 21 to April 27, 2025. 
You have approximately 18 hours remaining to submit this answer and earn Binance Points. These points can be redeemed for various rewards, including token vouchers and trading discounts. 
To participate, open the Binance app or website, navigate to the WOTD section, and enter the word SYSTEM. Completing the daily challenge not only enhances your crypto vocabulary but also contributes to your rewards tally.