what is the symbol of and?

Answer 1

The ampersand -- the thingy over the 7, looks like this: &

Answer 2

Depends on whose logic text you're using. There's less consistency than among mathematicians. Quine wrote pq for "p and q." Other write it as p•q, or even p&q. They all use v for "or," since it was short for the Latin "vel."

Answer 3

&

Answer 4

&