What does T stands for in C#?

public T[] Reverse<T>(T[] array)
{
    var result = new T[array.Length];
    j=0;
    for(int i=array.Length; i>= 0; i--)
    {
        result[j] = array[i];
        j++;
    }
    return result;
}

string[] array = new string[] { "1", "2", "3", "4", "5" };
var result = reverse(array);Will produce a string array in result of { "5", "4", "3", "2", "1" }

public string[] Reverse(string[] array)
{
    var result = new string[array.Length];
    j=0;
    for(int i=array.Length; i >= 0; i--)
    {
        result[j] = array[i];
        j++;
    }
    return result;