Every single spectral sequence I have seen in my life was denoted by $E$. Even when there is more than one spectral sequence, people tend to use the same letter with some workaround (e.g. a **fourth** pedix on the left).

Why don't we open our mind and start to use the letters we like more (like the initial of the guy that gives the name to the spectral sequence)?

My real question is: are there good reasons to continue using $E$, or can I use different letters? Do you think I will be asked to change it back to $E$ by reviewers?