The Rule of three is... one of those 'laws' about the Planes, about everything tending to happen in threes... or everything's composed of three parts, or there's always three choices, and so on and so forth.
Who would cross the Bridge of Death must answer me these questions three!
"Just the place for a Snark!" the Bellman cried,
As he landed his crew with care;
Supporting each man on the top of the tide
By a finger entwined in his hair.
"Just the place for a Snark! I have said it twice:
That alone should encourage the crew.
Just the place for a Snark! I have said it thrice:
What I tell you three times is true."
Genies don't grant just two wishes, nobody talks about the two Musketeers, and you never hear anyone say "second time's the charm."
Stories are like Charlie's Angels
! They should come in threes
—Disco Stu, Simpsons Comics #175
Three is a sacred number. There are three Fates, three Furies, three Olympian sons of Kronos. It is a good strong number that stands against many dangers.
One time is happenstance, two times is coincidence, three times is intentional.
— An old adage.
They took my dressing room, my parking space, even my writers so I don't have a funny third item!
: So that was the year of the slow invasion. When the Earth got cubed and the Doctor came to stay. It was also when we realized something the Shakri never understood. What 'cubed' actually means. The Power of Three.
What is it with threes? Eidolon controls three powers, Valkyrie controls three “warriors,” that Endbringer copied three capes. The are three Triumvirates.
The first with Alexandria, Eidolon, and Legend. The new one with Legend, Chevalier, and Valkyrie. And one that was hinted at with Riley, Nilbog, and Valkyrie. Taylor had three different names; Skitter, Weaver, and Khepri. There are three entities in the story. I don’t know, maybe its a coincidence.
There was even a ‘three’ at the very beginning–Emma, Sophia, and Madison.
— Commenters snickle
discussing this trope as it applies to Worm
''A man and a woman had a little baby
There were three in the family
That's a magic number.
That's the brute who raped my country, Thrace! Pseudolus:
He raped Thrace? Philia:
And then he came and did it again! And then again! Pseudolus:
He raped Thrace thrice?