One of the mysteries of the English language finally explained.
A court order prohibiting the publication of information which might lead to the identification of a child who is a ward of court or otherwise involved in legal proceedings.
1990s; earliest use found in The Guardian. From the name of Mary Bell (b. 1957), who was tried for manslaughter in 1968 + order.
Mary Bell order/ˌmɛːrɪ ˈbɛl ˌɔːdə/
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