The most common and most likely answer to this crossword clue is the 11 letter word HEXADECIMAL
H
E
X
A
D
E
C
I
M
A
L
Buddy explains!
The straight part
We know that "relating to computer characters" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case relating to computer characters = hexadecimal.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does HEXADECIMAL mean?
HEXADECIMAL noun- A number system with base sixteen, using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F, most used in computing as a hexadecimal digit can represent four bits, half a standard byte.
- A number expressed in the hexadecimal system.
- Of a number, expressed in hexadecimal.