import random
from tkinter import *

root = Tk()
root.geometry("700x450")

l1 = Label(root,font=("times", 200))

def roll():
    number = ['\u2680', '\u2681', '\u2682', '\u2683', '\u2684', '\u2685']
    l1.config(text=f'{random.choice(number)}{random.choice(number)}')
    l1.pack()
b1 = Button(root, text="lets roll....", command = roll)
b1.place(x=330,y=0)

root.mainloop()