SAP S for Hana?
I believe it is branded as SAP S/4 HANA, not "S for", although it is pronounced the same way.
This follows the major SAP re-engineering nomenclature: S/2 (before my time), S/3 (what most people are using today for SAP ERP, although also called many other things) and S/4 (SAP ERP on in-memory).
Of course, as the article notes, the marketing bods at SAP have great fun changing version names all of the time - I could well be out of date myself. I just develop on it and sometimes an upgrade gives us new toys to play with.