When talking users through typing arcane commands over telephone, we'd often use a slightly modified phonetic alphabet, eg:
P for phonetic (or psycho, depending on the user's current state of humour)
A for aisle
C for czar (also cent)
E for Europe (also E for Ewe *, E for Eye *)
G for gnome
H for hour
J for Juan (our Chilean workmate - true)
K for knight
L for fifty #
M for mnemonic
O for one
T for tsunami (after 2004 we changed to tsar)
V for five #
W for why *
X for ten #
Y for you *
* = letters that sound like other letters
# = roman numerals
and sometimes we'd use these, even though they didn't quite "flow" right:
I for one #
C for hundred # is really C eg century
M for thousand # is really M eg millennium (still useful because most of our users had never heard of the word "mnemonic")
N for negate (or N for negation)
The things programmers do to make their work more entertaining.