Feb 15
Wikipedia will tell you that the international symbol for accessibility is the wheelchair symbol. The International Commission on Technology and Accessibility have designated (and copyrighted) this as the International Symbol of Access (ISA).
The symbol is clear, and it denotes wheelchair access. An alternative to stairs or other obstacles which obstruct the access to wheelchairs will not be found where you see this symbol.
Here are a few symbols that could be used as an alternative to a wheelchair:
