# I have three legs. Who am I?

I have three legs.

I represent zeros and ones.

I am the 20th century, most important invention.

I am the most evolved piece of technology in history.

I am a building block for the processor.

Who am I?

• I've downvoted this puzzle because it takes literal aspects of an object and describes them directly, and shows minimal effort to create a well-developed puzzle. – user20 Aug 19 '16 at 14:45
• I've downvoted because of the same reasons as Emrakul, basically. Also note that the riddle tag says: "A riddle gives indirect clues about an unnamed object [...]". In my opinion you've had the right idea and simply described the object but didn't provide clues, especially not indirect ones. – Avigrail Aug 20 '16 at 8:41
• Down vote from me for same reason. – A E Aug 20 '16 at 10:58

Is it

Transistor

I have a three legs.

It has three pins.

I am representing zeros and ones.

Resistor–transistor logic (RTL)

I am most important invention of the 20th century.

yes it is.

I am most evolved piece of technology in history.

The first transistor was about the size of the palm of a hand, with a depth of two matchbooks stacked on top of each other. Now it is in NM.

I am building block for the processor.

transistor is the building block for the processor.

• right answer... – Smart Aug 19 '16 at 10:35
• im amazed by the current size of them. ... nanometers :O a few atoms – lois6b Aug 19 '16 at 10:52
• @lois: That's still way bigger than the atomic scale. – Deusovi Aug 19 '16 at 15:24
• @Deusovi: Well, only one order of magnitude. Atomic diameter ranges from 0.1 to 0.5nm. So, actually, lois is correct. – Lightness Races in Orbit Aug 20 '16 at 10:49

My guess:

Transistor

I have a three legs.

Transistor have three legs.

I am representing zeros and ones.

Yes its representing 0s and 1s in memory organisation.

Computer/code

I have three legs.

Monitor, mouse, and keyboard

I am representing zeros and ones.

Computers work in binary

I am most important invention of the 20th century.

It is.

I am most evolved piece of technology in history.

Yeah...

I am building block for the processor.

:/