Hives, for example, come in two types -- acute and chronic -- and are usually caused by your body releasing histamine in reaction to an allergy. Histamine is an organic compound in your body responsible for triggering the inflammatory process.
If you have a checking account, the bank prints your account number on the bottom of your checks as the second number after your routing number. You can have the same account number at different institutions, but not the same account and routing number.
A bank routing number or routing transit number (RTN, ABA) is a 9 digit number that identifies the location where your account was opened. You'll often be asked for your checking account routing number when you're making a payment online or by phone.