A  |  B  |  C  |  D  |  E  |  F  |  G  |  H  |  I  |  J  |  K  |  L  |  M
N   |  O  |  P  |  Q  |  R  |  S  |  T  |  U  |  V  |  W  |  X  |  Y  |  Z

Quarantine: A restraint placed on an operation to protect the public against a health hazard. A ship may be quarantined so that it cannot leave a protected point. During that period, the Q flag is hoisted.

Quoin: A wedge-shaped piece of timber used to secure barrels against movement.

Quota: The quantity of goods that may be imported without restriction or additional duties or taxes.