Which country, not signing the Charter at San Francisco, is still considered an original member?

Poland is considered an original member of the United Nations despite not having signed the Charter at the San Francisco Conference in 1945. This unique status arose because Poland’s government-in-exile was recognized as a legitimate representative of the Polish state by the Allies during World War II, which allowed it to be included among the original members of the UN. When the Charter was adopted, Poland was acknowledged as an original member even though its representatives were not present at the conference.

The other countries listed did sign the Charter or have other circumstances regarding their membership that do not confer upon them the same original member status without a signing event. Thus, Poland stands out in this context.