What is implied by the presence of non-critical symbols in the notes?

The presence of non-critical symbols in notes suggests that while they may not be essential for the immediate understanding of the main instructions or information, they can still contribute to the overall context of the commands. These symbols can provide additional insights or clarifications that, while not critical, enhance the comprehension of the data. They might help in interpreting specific situations or provide useful information that can influence the understanding of processes or practices associated with welding and cutting. Recognizing that these symbols may play a role in conveying commands allows one to appreciate their potential importance, rather than viewing them as purely ornamental or without function.

In contrast, the other options imply dismissiveness or a lack of utility regarding the non-critical symbols, which does not accurately reflect their possible role in nuanced understanding within the field.