got me thinking, what is the "CPA" equivalent for ID?
You can't call yourself a doctor without a professional accreditation/ membership, but (at least here) anyone can call themselves an "Industrial Designer". The DIA has an 'accredited designer' programme, and the DIA is part of ICSID, but from what I can see it is based on national membership, i.e. in the USA join the ISDA and you get the same sort of ICSID membership, but what it means to be an Australian ID'er and a US ID'er depends on the respective national body.
Is there an international membership for Industrial Design?