What does this mathematical symbol mean?

What does this mathematical symbol mean?

A ∝ B means that a is proportional to B. for example, in v = s / T, V is proportional to s, so we can write V ∝ S. when a is inversely proportional to B, we often write a ∝ 1 / b. this symbol "∝" (comparison "∞") indicates that the physical quantities on both sides have a certain proportional relationship, including proportional and inverse ratio, This is often encountered in the research of new subjects. Sometimes, it is used to express the relationship between some quantities clearly or briefly