Name the parameters that characterise a unit cell.

(N/A) unit cell is characterised by six parameters:
$(i)$ The dimensions along the three edges,$a, b,$ and $c$. These edges may or may not be mutually perpendicular.
$(ii)$ The angles between the edges,which are $\alpha$ (between edges $b$ and $c$),$\beta$ (between edges $a$ and $c$),and $\gamma$ (between edges $a$ and $b$).