I was curious. So on the Ubuntu terminal, echo -e "\0033]31;47m $USER \0033[0m" prints nothing, and echo -e "\0033p31;47m $USER \0033[0m" skips the p and prints the rest of the text 31;47m matt. I have also seen terminal emulators that output entire error messages when they encounter esc sequences that they don't know.

I don't know if there is an official RFC for unknown code, but I assume that ignoring the \0033 and the everything up to and including the next letter is a good thing, so that echo -e "\033[1mHello\033[0m" would print a very readable Hello, even if the terminal does not understand the esc sequence for the "bold" attribute.

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