The letter U in braille
dots 1-3-621 of 26⠥
U in braille is dots 1-3-6. U is A plus dots 3 and 6.
A capital U has the capital sign, dot 6, in the cell before it: ⠠⠥.
In Grade 2 (contracted) braille, u standing alone as a word means “us”.
Don't mix it up
Now write it yourself
Tap the dots for U, then Enter. On a keyboard, press F D S / J K L together and let go.
Remember it, don't just look it up
U is in Letters U–Z. Braille a Day brings it back tomorrow to answer from memory, then again just before you'd forget. Five minutes a day.