The point at (0°, 0°) is not generally given a name
All geographers, cartographers and surveyors ought to know the following, but I reference some sources anyway:
According to Matt Rosenberg
The point at which the equator (0° latitude) and the prime meridian (0° longitude) intersect has no real significance but it is in the Gulf of Guinea in the Atlantic Ocean, about 380 miles (611 kilometers) south of Ghana and 670 miles (1078 km) west of Gabon.
Also, according to wiki/Geographic_coordinate_system#Geographic_latitude_and_longitude
The 0° parallel of latitude is designated the equator ...
The meridian of the British Royal Observatory in Greenwich, a little east of London, England, is the international Prime Meridian ... [is the 0° meridian]
...
The grid thus formed by latitude and longitude is known as the "graticule". The zero/zero point of this system is located in the Gulf of Guinea about 625 km (390 mi) south of Tema, Ghana.
And at Fact Monster's Geography Glossary:
Zero degrees (0°) latitude is the equator ... Zero degrees longitude (0°) is called the prime meridian.
While "the origin" might well work – after all, that is what we call (0, 0) on a plane coordinate system – the point at (0°, 0°), on a spheroidal system, is not generally given a name. Certainly, none of the above (3 refs) give it a name, and until now, I'd never heard of Null Island.
On the other hand, when referring specifically to geodetic coordinate systems, the use of the term "origin" usually refers to one of three things, none of whichnone of which are at (0°, 0°):
- the very center of the ellipsoid representing the Earth (see [wiki/Geodetic_datum#Other_Earth-based_coordinate_systems] 4 or wiki/World_Geodetic_System#Main_parameters)
- the datum or place, on the surface, used to relate the mathematical model and the physical Earth (see [wiki/Geodetic_datum#Reference_datums] 6)
- the center a map projection or standard lines of a given projection, where the distortion is zero (see geography.hunter.cuny.edu/~jochen...Map coordinate systems/Projection parameters or georeference.org/doc/lambert_conformal_conic) NB: The center of a map projection could very well be at (0°, 0°) but it is not generally so.