Energy which is transferred due to a temperature difference is sometimes known as heat or heat energy (or even thermal energy, although this is not a standard term). Conduction is sometimes described as a thermal energy transfer. You will have to decide if any of these terms are appropriate to your own scheme of work.
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American Express card numbers. For American Express cards, the number is always 15 digits long and it always starts with 34 or 37. The 3rd and 4th digits indicate the card type (business vs. personal) and the currency.