What does Sliver mean?
The continuous strands of that come from the carding process and are untwisted. Sliver is the loose and soft fibres that a created through the carding machin in the yarning process.
Style Terms explains Sliver
Slivers are long, loose ropes of fibers created during the carding process that may be further straightened and compacted during . The slivers are then drawn, or drafted, into roving.