No, it makes sense, although as you say there's no rule, so some will use "SPA" and others "S-P-A". I'm reading it as "an S-P-A" now and it feels so, so much b

No, it makes sense, although as you say there's no rule, so some will use "SPA" and others "S-P-A". I'm reading it as "an S-P-A" now and it feels so, so much better :)