Help with Chopin's Prelude op 28 no 4

[trus]

Or should I name it as helps reading it!!
as I have just recently resumed playing after many years of not doing anything, the hardest thing I find is reading sheet music.
I am a biy unsure about this bit towards the "stretto" part

 Don't know what the sign is called and what is the principle.?? I mean the x sign and 4312 fingering above it? Thanks in advance!

[virtuoso80]

I believe that's a 'turn' you're referring to. It's actually plays like it's shape, so in that case it starts on A# and then you go B-A#-A-A#. Listen to a performance on youtube to hear how it sounds.

[trus]

I believe that's a 'turn' you're referring to. It's actually plays like it's shape, so in that case it starts on A# and then you go B-A#-A-A#. Listen to a performance on youtube to hear how it sounds.

Thanks a lot, your answer refreshed my memory