Created in 1945
headquartered in new york city
192 countries are members
general assembly and security council are its two main bodies

these are all describing which international group?

The correct answer is the United Nations. As of now however, there are 193 countries, which is a lot more than in 1945 when there were 51 member states. The territory in New York where the headquarters are are considered to be international territory. It is the most famous international organization in the world.

Assemblies do not have written codes of laws. laws are matters for magistrates and courts, not assemblies. codes of law are things such as civil law, criminal law, and constitutional law. what assemblies have are procedures regarding debating, voting and other business they might carry out.  also note that rome had three assemblies: the assembly of the soldiers, the assembly of the tribes, and the plebeian councils.