TSUNA
The Japanese word tsuna means rope, but acquired a whole new dimension in the context of the shinto religion, and therefore in that of sumo. In fact, the tsuna as we know it in sumo has its origins in the shimenawa, a sacred rope hanging across the torii (the gate at the entrance of a shinto shrine) or sometimes wrapped around a tree also at the shrine entrance. Very often it features hanging goheis, zigzag-folded paper strips that signify the presence of a kami, i.e., a shinto divinity, god or spirit.
source http://www.lemondedusumo.com/english/MDS14_tsuna.php?mag=mds&num=14