34 = the diagonal size, which is 34" in this case.
G = the line of monitors, so G for Ultragear
P = the year the monitor was made, which is 2021 in this case
63 = the placement in the line, bigger number is better
A = This I can’t actually find. I think it’s a feature set or possibly where you bought the monitor from. But it’s probably just an internal code LG uses.
So this is a LG Ultragear 34" monitor.
So you have