Coming after the news that they filed a trademark for an R logo similar to that of the Spirit R, Mazda has now done the same for another one of it’s icons: the rotary engine.

The trademark filing shows the rounded-triangle shape of a Wankel rotary engine’s rotor inside of which is the letter “e”. According to Hatena Blog, it falls under a group of eight trademarks the company filed, four of which pertain to something called “e-SKYACTIV R”. The first three trademarks were for “e-SKYACTIV R-Energy”, “e-SKYACTIV R-HEV”, and “e-SKYACTIV R-EV”, while the fourth was the logo itself.

Read More: Mazda’s MX-30 Rotary Range Extender Has Been Put On Hold

It’s believed that “e-SKYACTIV R-Energy” is somewhat of a blanket term for the automaker’s xEV technology and “e-SKYACTIV R-EV” is for applications like the planned rotary range extender in the MX-30 EV, but the real interesting one here is the “e-SKYACTIV R-HEV”. By all accounts, it could be a rotary engine used for a hybrid electric vehicle, but if you believe the rumor mill, there is a chance it could be something much more exciting.

Recent patent filings show that Mazda has been cooking up a coupe with similar styling to the gorgeous RX-Vision concept, and other reports have claimed that they’ve been working on hydrogen-powered rotary tech. Combine those two things with these new rotary trademark filings and the R logo from last month, and it sure seems likely the company is working on, or at least thinking about, a second coming of the RX series.

See Also: Explore The Origins Of Mazda’s Rotary With This 1970 Cosmo Series II

Could we be seeing a performance car renaissance from Mazda? Given the recent resurgence of Japanese sports cars like the Nissan Z and the Toyota Supra, it’s possible, but with the relatively small automaker also planning on offering an inline-six down the line, they could stretch themselves too thin if they actually attempted a rotary sports car revival. On the other hand, it would surely please RX-7 (and RX-8) fans and would act as a great halo car for the brand, so if they’ve managed to solve the rotary’s issues, namely its obscene consumption and, well, questionable reliability, it could make lots of sense.