| Access Control |
| Controlling access to a port of entry in a physical area or into a computer. See Electronic Access Control. |
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| ACU |
| Access Control Unit(Access Panel). |
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| Access Level |
| A level of authorization defined by a reader (or readers) and the times those readers can be accessed. |
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| Access Point |
| A physical point of entry or exit, such as a door or gate, which is controlled by the system. |
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| ACK |
| Abbreviation for Acknowledge. |
