different spears in southern kung fu

[RAIN]

i have curiosity about the different types of spear in kung fu .
i always train with the single point spear and i want tro know about that half hook spears . they belong to a particular system or are only a variation that can be used in most forms ?

[lungyuil]

I know Jow Ga has a snake spear with a crescent half moon on the side. I never learnt the form, nor have i seen it practiced.:)