what is the 13th letter of the alphabet: crossword clues

Matching Answer
Confidence
ETA
60%
CDE
60%
DEE
60%
SIN
60%
RST
60%
RHO
60%
OMEGA
60%
PSI
60%
ZEE
60%
STU
60%
e.g. Greek Cheese
e.g. O?D (Use ? for unknown letters)