How many restraining orders does Sheldon have?

Question

In series The Big Bang Theory, Sheldon Cooper has received restraining orders from famous real-world people. He has already received them from:

1. Leonard Nimoy
2. Stan Lee
3. Bill Nye
4. Carl Sagan

My questions are:

1. How many restraining orders Sheldon Cooper has got?
2. How did he get those restraining orders and why? It's shown how and why he did get from Stan Lee (in episode The Excelsior Acquisition) and Bill Nye (in episode The Proton Displacement). How and why did he get restraining orders from others?

Answer 1

The four you mentioned:

Sheldon has restraining orders from his heroes Leonard Nimoy, Carl Sagan, and Stan Lee, as well as television scientist Bill Nye.

These are mentioned in the episodes The Excelsior Acquisition (Stan Lee), The Vacation Solution (Carl Sagan), The Bath Item Gift Hypothesis (Leonard Nimoy), and The Proton Displacement (Bill Nye).

This is confirmed by this specialized entry on bigbangtheory.fandom.com.

Although not mentioned explicitly, plus one from Zachary Quinto, as implied in S10E16, The Allowance Evaporation (see below for proof).

But there could follow more, of course

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The reasons for the other three restraining orders - besides the ones you mentioned - are not all made clear.

• The only time he mentions Carl Sagan's, is in The Vacation Solution, when he walks in on Amy with freshly washed glassware and tells her

  Here you go! This is now the only lab with glassware washed by a man with two doctorates and a restraining order signed by Carl Sagan.

• And the only time Nimoy's is mentioned, is in The Excelsior's Acquisition:

  Sheldon: I’ll tell you where I’ve been. You boys may have had gelato with Stan Lee and gotten autographed comics, but I saw the inside of his house and got an autographed application for a restraining order.

  Howard: Sweet.

  Sheldon: Plus, I get to hang out with him again at the hearing. This is going to look great hanging next to my restraining order from Leonard Nimoy.

• Zachary Quinto's restraining order, however, is due to Sheldon following him into the bathroom:

  Amy: Sheldon, there’s a difference between greeting a friend and following a celebrity into a bathroom.
  Sheldon: If the judge couldn’t explain it to me, I don’t see how you will. If you think [saying hi to seeing someone you know in a public space is] more fun than talking to Zachary Quinto through a stall door, you’re crazy.

  ^{See the episode's script for more details}

It probably - and this is pure conjecture - involves his enthusiasm concerning these idols of him mixed with his social ineptitude getting the better hand of him.

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^{Sources:
https://en.wikipedia.org/wiki/Sheldon_Cooper#Personality
https://bigbangtheory.fandom.com/wiki/Leonard_Nimoy
https://bigbangtheory.fandom.com/wiki/The_Vacation_Solution
https://bigbangtheory.fandom.com/wiki/The_Allowance_Evaporation#Trivia}