Fingering
When playing keyboard instruments the fingers are numbered from 1 to 5 on each hand: the thumb is 1, the index finger is 2, the middle finger is 3, the ring finger is 4 and the little finger is 5.  The fingers were not always numbered like that.  In Britain in the 19th century the thumb was shown by a cross (+) and the fingers were numbered from 1 to 4.  This was known as “English fingering” while the other way (from 1 to 5) was known as “Continental fingering”.  However, from the beginning of the 20th century the British used the normal 1 to 5 (Continental) fingering.