The PU in your pending transactions stands for "purchase". AW would stand for "account withdrawal". I had the same question so I emailed Regions and this is what they said.
Account Withdrawal
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MAE mean on a bank statement
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ITL on a bank statement means International.
what does LU mean on a statement transaction
on a bank account statement, it means Payable On Death
indication
Electronic Bank Payment
what does a contingent mean on a bank statement.