What does TRM mean?

im reading the DeveloperGuide, refer to Jetson Orin NX and Nano Series — NVIDIA Jetson Linux Developer Guide 1 documentation
when i see

  1. In TRM, click System ComponentsMulti-Purpose I/O Pins and Pin Multiplexing (PinMux)Pinmux Registers.
  2. Search for the pin name (for example, SOC_GPIO37).<>
  3. Write down the complete pin name.

can you tell me what TRM mean? I cannt found in jetson

TRM is Technical Reference Manual, you can refer to Orin Series SoC Technical Reference Manual

thanks