What does "LL" mean on BB spindle?
I don't know anything about bottom brackets, but I found this document which says (on page 16):

Shimano cartidge-bearing bottom-bracket spindles are marked with letter codes that correspond to different length spindles. These codes and the corresponding spindle lengths are:
Code Length
MM 107mm and 110.5mm
LL 113mm
D-H 115mm
YL 116mm
XL 118mm
ZL 121mm
NL 122.5mm
EL 127.5mm