The initials SMJ belong to several established publications. In management scholarship they mean the Strategic Management Journal, founded in 1980 and published by Wiley for the Strategic Management Society. In medicine they mean the Singapore Medical Journal, the monthly journal of the Singapore Medical Association, published since 1960. In museum and Southeast Asian studies, the Sarawak Museum Journal carries the same abbreviation.
Beyond journals, SMJ appears as initials for companies, schools, and individuals, which is why a bare domain name like smjpro.com is ambiguous. Without archived content, there is no reliable way to know which meaning a previous site owner intended — one more reason this reference page sticks to documented facts.