For "hashbang" you can directly derive it from # ("hash") and ! ("bang")

There are also many different ways that people pronounce -> and =>, although it might vary depending on programming language.

<=> is the "spaceship" operator in Perl, Ruby, and Groovy.

How do you pronounce it?

I usually say "arrow", or "dash-greater-than"... but come to think of it, I very rarely have to ever actually say this.

=> is known as a fat comma or a rocket in Ruby circles.

Rocket makes sense, but fat comma?

In Perl "=>" is (almost) a comma, i.e. { a => 1, b => 2} is the same as { "a", 1, "b" , 2 }. I assume Ruby with its Perl heritage has this to some degree.