So specify auto-canceling stretched characters, Esc so specify auto-canceling stretched characters, Specify auto-canceling stretched characters – Brother TD-2120N User Manual
Page 38: Esc so

ESC/P Command Reference
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5. Control Command Details
SO
Specify auto-canceling stretched characters
ASCII: SO
Decimal: 14
Hexadecimal: 0E
Parameters
None
Description
Prints the subsequent text at double width.
This command is canceled with DC4, LF, VT, FF, or an automatic line feed.
This command is canceled with ESC $ or ESC \.
This command can also be canceled with ESC W+0.
ESC SO
Specify auto-canceling stretched characters
ASCII: ESC
SO
Decimal: 27
14
Hexadecimal: 1B
0E
Parameters
None
Description
Same as SO
Example
Code:
ABC ESC SO ABCDEFGHIJK…XYZ FF
Print result: ABCABCDEFGHIJK…(Automatic line feed)
XYZ