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The designation letter for the control board PCB test points is "T" (T1-T20).

The parts list has references T1-T11 which are spacers and threaded stand-offs.

To avoid ambiguity the test point designator prefix could be changed to "TP", which is recommended by ASME Y14.44 and IEEE Std 315 Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters).

Implementing this change will also improve the relevance of search results when using GitHub search, or searching a local copy of the documentation.

Notes

1. Other designation letters on the control board PCB are "J" (connectors), "C" (capacitors), and "R" (resistors). All of which comply with the suggestions in section 22.4 of ASME Y14.44 and IEEE Std 315; and do not conflict with a part reference in parts_list/master_parts_list_raw.csv.
2. The designation letter "T" is suggested for transformers and coils.
3. Those who don't have access to ASME Y14.44 or IEEE Std 315 may refer to https://en.wikipedia.org/wiki/Reference_designator.

It is worth noting that the Arduino shield is using the "TP" designator prefix TP1-TP8 so already complies with ASME Y14.44.

closing since no longer relevant with latest update