Hello Eric,
yes "SAP S/4HANA, on-premise edition 1511 Feature Package Stack 01" is the official name. 1602 was an in-between term.
"SAP S/4HANA, on-premise edition 1511 Feature Package Stack 01" is following the initial implementation stack (= "SAP S/4HANA, on-premise edition 1511").
To make it complete, there is additionally "SAP S/4HANA Finance, on-premise edition 1503". On this page then everything listed together.
SAP S/4HANA – SAP Help Portal Page
Kind Regards,
Frank