Some text positions separate the first letters from the first number part so that they are displayed in two lines, one above the other.
The split happens at the first number (0 to 9) that follows a letter (a to z, Ato Z)
If there is no such split then the tag is not divided into two lines
A Space does not count as a letter, so for example R 123 does not split but R123 does.
Numbers at the start do not cause a split, so 10R123 splits into 10R and 123