-sh- isn't a native piece of orthography; hash is clearly loaned in from English. Is there a more purist way of spelling (or even translating) this?
What does ‘nod’ mean on its own?
The 'ap geiriaduron' dictionary for smartphones is great for this sort of technical term.
Some meanings of 'nod' which are relevant here are:- 'character' or 'mark'
Thanks rm. AnCatDubh - It's also used for the translation of "apostrophe r" that we hear each time we use the " 'r"... "collnod r" ( literally: "a loss mark")