The horizontal 8-∞ symbol can be input with special characters of word. Take Word20 16 as an example, the specific steps are as follows:

1, create a new word and open it, and then click Insert;

2, then click on the symbol/other symbols;

3. In the symbol window that pops up, select "(plain text)" as the font and "mathematical operator" as the subset; ?

4. Click Select ∞, and then click Insert/Cancel;

5. Click Cancel to close the symbol window, and then you can enter the desired ∞.