Reversing a single linked list means reversing the order of the nodes in the list, such that the last node becomes the head of the list and the head of the list becomes the last node. Here's an example of how to reverse a single linked list using C:

```
void reverseList(struct Node** head) {
    struct Node* previous = NULL;
    struct Node* current = *head;
    struct Node* next = NULL;
    while (current != NULL) {
        next = current->next;
        current->next = previous;
        previous = current;
        current = next;
    }
    *head = previous;
}
```

In this code, we use a iterative approach to reverse the linked list. We start by setting three pointers: `previous`, `current`, and `next`. The `previous` pointer is initially set to NULL, while the `current` pointer is initially set to the head of the list. We then traverse the list one node at a time. For each node, we set the `next` pointer to the next node in the list. We then set the `next` pointer of the current node to point to the previous node (i.e., we reverse the `next` pointer). We then update the `previous` pointer to point to the current node, and update the `current` pointer to point to the next node. We continue this process until we have traversed the entire list. Once we have finished traversing the list, the `previous` pointer will point to the last node in the original list, which is now the new head of the reversed list. We update the `head` pointer to point to the new head of the list, and we are done.

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