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The `*` for variables and not mathematical operators are the pointers.

Assigning a pointer goes this way:
```c
char *text; // string
```

Here, we assign a pointer named `text` and its type is a `char`, but alternatively, this is a string.

As for your question, `int *ptr` is basically the same as `int* ptr`, only being a pointer of an `int`, and nothing else. Your given `struct Node* next` is the same as `struct Node *next`, and I don't think `ptr*` even exists, unless it's made as some `union` or `struct`. `struct *Node` wouldn't work likely.