Life In Triplicate

My friend Maureen came up with that line, and I had to use it.

And it got me thinking that there are a lot of things that come in threes, or have three parts, or involve the number 3. It turns out that 3 is a significant number that turns up, well, just about everywhere. In design, three is the minimum number of objects needed to create visual tension. Many schools of philosophy include three-way ideas, such as Aristotle's 3-in-1 idea (Mind, Self-knowledge, and Self-love), or Francis Bacon's three tables (presence, absence, degree).

Things that come in threes, involve three, etc:

My newborn grandkids, the most perfect little people in the world
Flute Trios
Good luck
Bad luck
Little Pigs
Billy Goats Gruff
Blind Mice
Bears (Goldilocks and the...)
Wise Men
Wishes
French Hens
Half of a knitted 6-stitch cable
Catholic Holy Trinity
Wheels on a tricycle
Movements in a sonata
Holiday weekends
Pigs In A Blanket
Months in each season

Image zones (not to be confused with the Zone System)

First odd prime number

Dimensions

Dog Night

Populations in Plato's Utopian city

Tic-Tac-Toe

Stooges

Phony dollar bills

Waltz time

Bean Salad

Is the third unique Fibonacci number

Cheers
Social group types in Great Apes

Meals a day

The adhesive company that makes sticky notes

Tenors

Geological divisions of the Earth

Strikes
Outs

Tolkein's rings

Days between Jesus' crucifixion and resurrection

Asimov's Laws of Robotics

Distinct species of the genus Homo

Semicircular canals in the human ear

Types of galaxies

Leaves on a Shamrock

R's

Letters on eight of the eleven numeric buttons on a touch tone phone

Power states: on, off, pause

Points in a right angle

Types of relationships between database table

A type of bet, and also the money positions in a horse race

Hat trick

Times that something is attempted

Hat worn by soldiers in the American Revolution, and also by Chelsea Pensioners in formal dress

A crowd

The Kentucky Derby, the Preakness, and the Belmont Stakes

Of a kind

Peas in a pod
Names in Neil deGrasse Tyson's name
Time a lady
Musketeers
Amigos
Faces of Eve
Questions (Monty Python and the Holy Grail)
Shells (Demolition Man)
Cherries on a pawn shop sign
Light bulbs (three-way)
Company
Short blasts or signals from a ship meaning "I am operating astern propulsion"

What are your three things?