The Union Jack, or Union Flag, is the de facto national flag of the United Kingdom. Though no law has been passed officially making the Union Jack the national flag of the United Kingdom, it has effectively become the national flag through precedent. The flag has official status in Canada, by parliamentary resolution, where it is known as the Royal Union Flag. Additionally, it is used as an official flag in some of the smaller British overseas territories. The Union Flag also appears in the canton of the flags of several nations and territories that are former British possessions or dominions, as well as the state flag of Hawaii. The claim that the term Union Jack properly refers only to naval usage has been disputed, following historical investigations by the Flag Institute in 2013.
