sky130.tech
A symlink to sky130A.tech.
sky130.tech -> sky130A.tech
The name without the variant letter is what ciccreator is invoked with in some flows, make ip for example passes ../cic/sky130.tech, while the file is named after the PDK variant it describes. The symlink means both spellings resolve to the same technology file, so an IP that copies either name into its own cic/ directory keeps working.