What does the other in OnTriggerEnter/Stay/Exit mean?

I am writing a script to change gravity when the player enters a button, But my OnTriggerWnter/Stay/Exit is not working and my guess to why is that 'other' as the second parameter does not include my player GameObject. I was wondering if i should put something else, The players tag is 'Player' and the layer is 'player' a sample of the code is posted below. Thanks for the help .

 using UnityEngine;
 using System.Collections;
 
 public class FlipZone : MonoBehaviour {
 
 
     public bool canFlip = false;
 
     void OnTriggerEnter(Collider)
     {
         Debug.Log("Player has entered trigger");
 
     }
 
     void OnTriggerStay(Collider)
     {
         canFlip = true;
         Debug.Log("Player is in trigger");
     }
     void OnTriggerExit(Collider other)
     {
         Debug.Log("Player left trigger");
         canFlip = false;
     }
 
 
 }

I have another script for movement and flipping the gravity.