Two definitions that I had to look up.
* Widow: a short final line of a paragraph that gets stranded at the top of the next page or column.
* Orphan: a first line of a paragraph stranded at the bottom of a page or column.
Those who lived through the (text-mode) WordPerfect era may remember 'widow and orphan protection' as being one of the features which was advertised for this program, i.e it could be set to either move that orphaned first line of a new paragraph to the next page or move a few extra lines or a whole paragraph to the next page to keep the widow company.
There are also Rivers - when spaces between words on multiple lines align vertically. Harder to control for than widows and orphans.
The German is more crass: Hurenkind and Schusterjunge, translates to 'child of a whore' and 'shoemaker boy'. The child of a whore does not know where it comes from (who is their father), the short final line - the shoemaker boy is so poor, he does not know where he will end up (the short first line)
https://de.wikipedia.org/wiki/Hurenkind_und_Schusterjunge
Edit: Also, LaTeX has specific penalties for those two: https://tex.stackexchange.com/a/32116