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RM57L843: Signal name designation added with a sort of code?

Part Number: RM57L843

Guys, from the launchpad schematic for RM57L843BZWTT, signals are named with a coded number. Example, AD1IN_0/7.3B

https://www.ti.com/tool/LAUNCHXL2-RM57L

What is 7.3B about? I also see 8.3B for both +5V and GND:

So again, what is the code about? or 8.3B in this case?

Thanks!