Braille is typically 2x3 cells of embossed dots. In puzzles where the touch aspect is not required for accessibility it can be presented in theme as 2x3 cells of circle-like things. Puzzles typically only use "Grade 1" English Braille which is a simple transformation of letters.
If you have a Braille letter not shown here it might be "Grade 2" Braille which allows for complicated contractions, but in the world of puzzles more than likely you've made an error.
A
B
C
D
E
F
G
H
I
J
⠁
⠃
⠉
⠙
⠑
⠋
⠛
⠓
⠊
⠚
K
L
M
N
O
P
Q
R
S
T
⠅
⠇
⠍
⠝
⠕
⠏
⠟
⠗
⠎
⠞
U
V
X
Y
Z
W
⠥
⠧
⠭
⠽
⠵
⠺
1
2
3
4
5
6
7
8
9
0
⠁
⠃
⠉
⠙
⠑
⠋
⠛
⠓
⠊
⠚
In the table above W is shown out of order to make it clear how Braille can be learned: the top four dots count the column number and the bottom two dots count the row number. W was not included initially in Braille because the alphabet used as the basis for the Braille alphabet (the French alphabet) does not have a W.