If you have wondered about the Porsche nomenclature, you are not alone. But we start here, with the 911S.

Sources:

1. Porsche – A brief history of the Porsche 911
   https://www.porsche.com/stories/innovation/a-brief-history-of-the-porsche-911/​

2. Porsche Newsroom – Porsche Historical Background: 1948–2025
   https://newsroom.porsche.com/en_US/company/porsche-cars-north-america-historical-background-18072.html​

3. Porsche Newsroom – History: 911 S (ST) (1969–1972)
   https://newsroom.porsche.com/en/press-kits/911-s-t/History-911-S-ST--1969-to-1972.html​

4. Porsche Newsroom – 60 years of the Porsche 911
   https://newsroom.porsche.com/en/press-kits/911-s-t/60-years-of-the-Porsche-911.html​

5. Stuttcars – Porsche 911 – Ultimate Guide (Every Generation & Variant)
   https://www.stuttcars.com/porsche-model-research/porsche-911-research/​

6. Wikipedia – Porsche 911
   https://en.wikipedia.org/wiki/Porsche_911​

7. Excellence Magazine – 1967 911 S Coupe (911) | Specs
   https://www.excellence-mag.com/resources/specs/24​

8. Stuttcars – Porsche 911 S 2.0 (1967–1969)
   https://www.stuttcars.com/porsche-911-s-1966/​

9. Hagerty – 1967 Porsche 911 S | Valuation Tools
   https://www.hagerty.com/valuation-tools/porsche/911/1967/1967-porsche-911-s​

10. Porsche Newsroom – Plain beauty – Porsche advertising ads between 1964 and today
    https://newsroom.porsche.com/en/history/porsche-advertising-ads-between-1964-and-today-10957.html​