| Quality Control | A monitoring of a manufacturing or storage process that determines the level of quality of the goods to be supplied. |
| Quarantine Stock | Stock being withheld from normal distribution due to product recall, inadequate documentation, contamination, or some other reason. |
| Queue | A linked list of waiting jobs.
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| Quiet Zone | Blank area on either side of a 1D bar code required for an accurate read of the code. Quiet zones for 2D bar codes must exist on all four sides. |
