In LaTeX, m \mid n (m divides n) is rendered as m ∣ n {\displaystyle m \mid n} inside math mode.
m \mid n
m ∤ n {\displaystyle m \nmid n} \nmid m ∣ n {\displaystyle m \shortmid n} \shortmid m ∤ n {\displaystyle m \nshortmid n} \nshortmid