I am developing a bespoke type family for a client that requires a set of fairly general pictograms to be included. There are toilets, elevator, stairs, parking, etc.
I didn't think much about it at first, assuming that such basic pictograms, extensively documented by ISO, would certainly be encoded in Unicode...
But it turns out some are not, even though they are probably amongst the most widely-used signage signs you could think of. 'First aid', for example, does not seem to have a corresponding Unicode value, neither does 'exit' (!!), 'parking', 'wheelchair accessible toilet', 'defibrillator', 'dogs prohibited', 'waiting area', 'stairs', etc...
Because I cannot quite believe that this is the case, I am asking for your expert advice: am I right, are they really missing from Unicode? Or did I miss a whole set of code charts? And if so, is there a background story that even comes close to explaining such omissions in view that any shit, literally, has a Unicode point? Is it because ISO claims some kind of IP on these signs? It's just baffling to me.
Thanks in advance!