I did avoid using 'different caps same letters' duplicates, though. All the acronyms I thought up can have the case changed willy-nilly, no probs.
I must've missed the seawyrm as I was scrolling down the list.
The exclamation point rankled with me, though if you were to do it with all the differents: splits, pygmies, chickens, cheeses and papers, it wouldnt be such a sore thumb. However, my personal preference still leans toward letterèd acronyms.
--- I'd advise against exclamation points though because of the connotation, Re. that I'd stay away from brackets, ! @ $ ^ ? also because of the 'sense' that comes across with the symbol. A whole lot of fuss over nothing? Perhaps, but would you like to imply that $P pygmy is $valuable$ , or that ?P pygmy is ?something unknown? # % & * ~ = seem fine though.
The seasonals issue was pointed out; There are already tonnes of acronyms that start with S. Take a look at the spreadsheet stogucheme Coronaviridae *facepalm* posted, scroll down to S and you may see why my second column 'alternates' seemed less cumbersome to me.
The one on my site is a bit more out of date, this^ one is updated heaps and you can compare other people's ideas at the same time.
I think I covered all response there?
Unless you'd rather mark the seasonals with a sun, maple leaf, snowflake, flower