Saint Andrew's cross

plural Saint Andrew's crosses

1. A diagonal cross, the figure of a cross that has a form of two intersecting oblique bars.

   Synonyms: saltire, crux decussata

2. The national flag of Scotland.
3. The sign or signal used at gateless level crossings, consisting of one or more red and white painted crosses sometimes with flashing lights.

   The International Railway Union has adopted for the purpose a special signal in the form of a single or double Saint Andrew's Cross, according as the line is single or double.

   1935, League of Nations, Advisory and Technical Committee for Communications and Transit: Permanent committee on road traffic. Report on the session of the committee ...

4. The plant Hypericum hypericoides.
5. BDSMAn upright X-shaped frame to which a participant can be tied.