A dominant constituent in the dynamic chromosphere are spicules .
Spicules at the limb appear as relatively small and dynamic jets that are observed to everywhere stick out .
Many papers emphasize the important role spicules might play in the energy and mass balance of the chromosphere and corona .
However , many aspects of spicules remain a mystery .
In this Letter we shed more light on the multi-threaded nature of spicules and their torsional component .
We use high spatial , spectral and temporal resolution observations from the Swedish 1-m Solar Telescope in the H \alpha spectral line .
The data targets the limb and we extract spectra from spicules far out from the limb to reduce the line-of-sight superposition effect .
We discover that many spicules display very asymmetric spectra with some even showing multiple peaks .
To quantify this asymmetry we use a double Gaussian fitting procedure and find an average velocity difference between the single Gaussian components to be between 20–30 km s ^ { -1 } for a sample of 57 spicules .
We observe that spicules show significant sub-structure where one spicule consists of many ’ threads ’ .
We interpret the asymmetric spectra as line-of-sight superposition of threads in one spicule and therefore have a measure for a perpendicular flow inside spicules which will be important for future numerical model to reproduce .
In addition we show examples of \lambda - x -slices perpendicular across spicules and find spectral tilts in individual threads providing further evidence for the complex dynamical nature of spicules .