I once tought GCE Chemistry so I can help.
Step one, Definition:
A Mole is: 6.02 x 1023 of anything.SIX point ZERO TWO times TEN raised to power TWENTY THREE
Step Two: Explanation
Now look at the Picture, its a mole (The animal). Look at the telephone no, do you see any connection with The Mole Concept?
"Peace is our profession, War is our business" ...Unknown