The "A" stands for "Approach". The loft is in between a pitching (P) wedge and a sand (S) wedge. Approach wedges are used for short, precise shots onto the green and are the same as Gap wedges.
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L stands for lob wedge, lob wedges have between 58 and 60 degrees of loft.
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The Nike golf site lists the A wedge as a 50 degree loft and 64.5 degree lie.