saltire

Etymology

From Middle French saultoir (“stile, saltire”) (compare French sautoir (“saltire”)), from sauter (“to jump, to leap”) + -oir (“suffix forming objects”), from Latin saltāre (“to dance, to jump”) + -orium, -oria.

noun

1. (heraldry) An ordinary (geometric design) in the shape of an X. It usually occupies the entire field in which it is placed.
2. The Saint Andrew's cross, the flag of Scotland.
   But the World Cup winning veteran's left boot was awry again, the attempt sliced horribly wide of the left upright, and the saltires were waving aloft again a moment later when a long pass in the England midfield was picked off to almost offer up a breakaway try. 1 October 2011, Tom Fordyce, “Rugby World Cup 2011: England 16 – 12 Scotland”, in BBC Sport, archived from the original on 2016-09-26
   It was early August. In the Borders, there were few signs yet of a campaign that could take Scotland out of the United Kingdom. A large Y-E-S hung in separate letters from a tree on the road from Coldstream to Kelso. There wasn't a N-O to match it, but Kelso town hall flew both the saltire and the union jack. 16 September 2014, Ian Jack, “Is this the end of Britishness?”, in The Guardian, London, archived from the original on 2016-04-18
3. The Saint Patrick's Cross, the pre 1922 flag of Ireland.