It is a shortcut indicating that the word should have two m's in succession.
However, I'm still hopeful of finding a shortcut through Laro.
A shortcut brought me—I could wish it had been shorter still.
"Well, I've got to be one of them," she said in her shortcut American way.
I don't want to walk up the hill, even if you do have a shortcut.
The jeep took a shortcut ...