Hello
it's not q3 rhen 03
It is never a letter in the official marking, it is exclusively numbering

For all those who didn't understand the labeling

".03" mean month, not quarter > Third quarter - Q3 is marked ".09" (in English, some other languages ​​use a different letter, e.g. - K )

It is the final month of the quarter.

Q1 > .03
Q2 > .06
Q3 > .09
Q4 > .12