Question 1147112
thaat's the union symbol which basically means the same as or
you can read that as (-infinity, -14) or {17, infinity)
here's a reference for you.
<a href = "https://saylordotorg.github.io/text_elementary-algebra/s05-07-introduction-to-inequalities-a.html" target = "_blank">https://saylordotorg.github.io/text_elementary-algebra/s05-07-introduction-to-inequalities-a.html</a>