DSS was created by Signature Plastics in the 80s to meet the requirements of the (then) new DIN standard for keyboards. It has a spherical top and is lower profile than their SA profile. The top surface resembles DSA.
DSS Lightcycle uses a 1-1-2-3-4-3 sculpt.
To compare DSS to keycap profiles you know, check out
Keycaps.infoFurther Reading:
SP’s DSS Spec SheetSP’s History of Keycap FamiliesNote: As SP does not offer spacebars smaller than 6u in the DSS profile, DSA blanks are offered as an alternative in the base, 40s, and spacebar kits.