Test Card X
The High Definition version of Test Card W is visually similar but officially lacks a designation letter. This version is often referred to as Test Card X, but this is not a designation which the BBC recognises. It is designed for use on High Definition TV services, and has been included a part of BBC HD's preview loop since November 2008 (though has been in use internally at the BBC since several years earlier).
Read more about this topic: List Of BBC Test Cards
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