(adsbygoogle = window.adsbygoogle || []).push({}); WHAT ARE THE MEANING OF THIS WORDS, AND OF THEIR LETTERS:

DEX
CEX
SEX (jaja)

Another thing, if I don't know the meaning of these words, what I don't know.

I SHOULD BE INTERESTED IN THESE THINGS IF I HAVE A PS3 SLIM WITH A 4.20 FW
MY FACTORY FIRMWARE IS 3.66?

No.
Cex-Retail PS3 Firmware
Dex-Debug/Dev PS3 Firmware
Sex-Kisok/Store PS3 Firmware
You cannot do anything with that PS3.