The new top class of the World Endurance Championship will be known as Le Mans Hypercar when it comes into force next season.
The hypercar name was billed as a working title when ideas for the replacement for LMP1 were first outlined in June 2018, but has now been formally adopted with a decision of Wednesday's FIA World Motor Sport Council in Paris.
WEC promoter the Automobile Club de l'Ouest had insisted that no decisions had been made about the name of the class and said it would consult fans of the series before making a decision.
The rules allow for prototypes that look like hypercars and racing versions of road-going machinery to race together from the start of the 2020/21 WEC next September.
The WMSC also revealed a shift in the rules that will mean Le Mans Hypercar competitors "must enter a homologated car under the name of an automotive brand".
The outline of the rules revealed in the week of the Le Mans 24 Hours in June suggested that an independent constructor would be allowed to build a prototype hypercar.
The text of the draft rules states that a competitor "may enter the homologated car under the name of a car brand", but it is understood that this will be changed to "must" at the next WMSC council in March.
There will be a teams' title awarded for the Le Mans Hypercar class rather than a manufacturers' crown.
Restrictions on testing in the top class of the WEC will be removed for the first season of the Le Mans Hypercar category. These will be reintroduced for season two.
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There will be a limitation, as in LMP1, on the number of personnel allowed by Le Mans Hypercar teams at the race track.
This has been set at 40 for a two-car team of non-hybrid machinery and 43 if the cars are hybrids.
The WMSC also confirmed the means by which LMP2 machinery will be slowed for the 2020/21 WEC season and subsequently in the European and Asian Le Mans Series.
The power of the one-make Gibson V8 normally-aspirated engine will be reduced by 30kW or 40bhp from approximately 600bhp to ensure that lap times for the LMP2s are slower than those of the new Le Mans Hypercars.
There will also be a single tyre supplier for the first time in LMP2.
Michelin has already been announced as the tyre suppler of the Le Mans Hypercar division.