Customize glossary with group titles

[joaomlourenco]

Discussed in #288

^{Originally posted by Marcelo-Alves7 February 1, 2022}
Hello professor,

I was trying to adapt the different glossaries in the template, and I changed the name, for example from "Chemical Symbols" to "Nomenclature", because it makes more sense to me.
However, it would be useful for me to be able to highlight some nomenclature by groups of families, for example, A for a group of numbers and letters G for a group of Greek letters S for a group of subscripts, similar to the image I generated in another document:

Can the teacher help me with this question, how could I create groups name in the "Nomenclature" glossary?

Thank You.

[dmfolgado]

Hi! Following the same topic, how could it be possible having a nomenclature section without requiring to instantiate the symbol in the main text? From my understanding, one needs at least to use a glossary/notation symbol so it can appear in the glossary/notation. However, I would like to have a general nomenclature defining matrices, vectors, and others without the need to use the symbol in the main text in order for the glossary/notation to appear. Thank you.