What does the symbol mean between a and b?

➷ It means 'AND.' If this is in references to a list or a Venn diagram, it would be the values in both A and B.

➶ Hope This Helps You!

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↬ ʜᴀɴɴᴀʜ ♡

see explanation

Step-by-step explanation:

A ∩ B denotes the intersection of the 2 sets A and B and is the set of elements which are members of A and also members of B.

This new set is written A ∩ B ( A intersection B ), for example

If A = { p, q, r, s } and B = { r, s, t }, then

A ∩ B = { r, s }