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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In the signature box or just to the right of it, you will see a series of digits. However long the series, the final three digits are the security code. American Express cardholders can find their security code on the front of the card, either to the left or right of the embossed 15-digit card number. These four digits are printed in black, not embossed.