Texas Instruments TI-83 PLUS - Manual (Page 522)

TI-83 Plus Programming 519
Program Output
Lbl, Goto
Lbl (label) and Goto (go to) are used together for branching.
Lbl specifies the label for a command. label can be one or two characters
( A through Z , 0 through 99 , or q ).
Lbl label
Goto causes the program to branch to label when Goto is encountered.
Goto label