Hi Mike.
This is a difficult question for me to answer.
I agree that mathematical symbols which have no mathematical meaning should be handled differently. But the Nemeth code book doesn't address this beyond certain symbols used in literary-only context such as a decimal point in a section number where the UEB "dot" is used.
However, I do not think the UEB symbols should be used for the equals sign or for the arrows in your example.
So what to do with symbols that are used to replace words? I am going out on my favorite limb again and suggesting that non-mathematical symbol be replaced by the word it represents, enclosed between TN indicators. You must be certain what the symbol means.
For example,
Sympathetic stimulation (tnelevatedtn HR, tnelevatedtn BP, tnelevatedtn intracranial pressure)
Patient self-reporting by numerical rating scale tnequalstn gold standard for assessing pain tnleads totn challenge in the ICU
State in a TN or on the TN page that you are replacing certain symbols with words.
I don't think this violates Rule 4.4.6.
Please correct me -- anyone -- if this is not a good idea.
- Lindy