Clarification on acronym TOS

[RCool.1]

The STM32WL5MOC datasheet (DS14084 - Rev 4 Feb 2024) contains the following comment on page 6.

"To keep an output power > 13 dBm, the TOS presented to the module should be ≤2."

Will someone please tell me what TOS stands for.

Best regards, 

Roy Cooley

[Tesla DeLorean · Accepted solution]

My hot take, from a quick search

TOS (Time-domain reflection coefficient): A measure of how much of a signal is reflected back from an antenna due to impedance mismatch.