The letter D in braille

dots 1-4-54 of 26⠙

dots 1-4-5. Dots 1-2-3 run down the left, 4-5-6 down the right.

D in braille is dots 1-4-5. A–J use only the top four dots (1, 2, 4, 5).

A capital D has the capital sign, dot 6, in the cell before it: ⠠⠙.

In Grade 2 (contracted) braille, d standing alone as a word means “do”.

After the number sign, d is the digit 4: ⠼⠙.

Don't mix it up

F: F is D flipped left to right (dots 1-2-4). Check which column the dots are in.
C: C drops dot 5 (dots 1-4).
E: E drops dot 4 (dots 1-5).
G: G adds dot 2 (dots 1-2-4-5).

Tap the dots for D, then Enter. On a keyboard, press F D S / J K L together and let go.

D is in Letters A–J. Braille a Day brings it back tomorrow to answer from memory, then again just before you'd forget. Five minutes a day.