What does this symbol ** mean in the C language -

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hi i'm new c language, can explains ** symbol mean.

typedef struct _treenode {         struct _treenode *left, *right;         tchar key[key_size];         lptstr pdata;     } treenode, *lptnode, **lpptnode;

if x pointer, *x dereferences it. **x same *(*x), **x dereferences pointer pointer. (eg, thing pointed thing x opints to).


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