# You're in-between a circle and a line in a certain envelope of mine. Who are you?

You're in-between a circle and a line, in a certain envelope of mine.

Who are you?

• Upvoted after the edit. – Rand al'Thor Apr 14 '17 at 13:19

Could it be

the letter P?

You're in-between a circle and a line, in a certain envelope of mine.

P comes in between O (a circle) and Q (a queue or line). The "in a certain envelope" bit is a hint towards looking at letters.

HA (laughter) + PEE (p) gives HAPPY (glad). The "silence" part refers to P for pianissimo in music.

• and 'p' for postcard? – Beastly Gerbil Apr 14 '17 at 13:59
• the silence part could be in like music, pp = pianissimo = super soft or ppp = pianississimo = super duper soft/practically silent? – indubitablee Apr 14 '17 at 14:46
• Or the silent P in "bath". – Rand al'Thor Apr 14 '17 at 18:50
• in a certain envelope of mine perhaps because P is a letter? – ETHproductions Apr 14 '17 at 20:49
• indubitablee and ETHproductions are correct. Seems like no one noticed the subtle clue in the first words. – Improve Apr 15 '17 at 0:53

I am

A Smile

You're in-between a circle and a line, in a certain envelope of mine.

Half of a circle, or a bent line, in various states... in an envelope of yours, your mouth.

Because we're all smiling, yo.

but too many of you will silence add.

Because smiling too much is creepy.

Based on idea by rand al'thor:

Letter M

Circle and line:

These are O and I. M is between (together with J K L and N). Envelope refers to Mail.

No idea for "glad". MMMMMMMM = silence (mostly).

• Ha (laughter) + m = Ham, which is kind of a meme from a Heroes of the Storm stream from I think last year, where an announcer really enthousiastically started screaming "they're going ham on the core". Might have to do with it. – Nzall Apr 14 '17 at 14:57

You're in-between a circle and a line, in a certain envelope of mine.

A Sinusoid. A circular form can be parametrically mapped as a trigonometric identity over a range of angles (a range can be referred to as an envelope in graphing terminology).

Slaughter - too many people being... silenced?

Who are you?

The letter S. The shape of the letter is a sinusoid.

(I'm really not convinced but I thought it was a fun thing to think about, but the "glad" part threw me off the scent to be honest).

Cocaine

You're in-between a circle and a line, in a certain envelope of mine.

You could have an envelope of cocaine in the middle of a line of cocaine and a top down view of a rolled up 100 dollar bill (circle).

From what I have seen in movies, cocaine can provide a high that goes along with laughter. Too much of it and you may die (silence).

Disclaimer:

I don't do cocaine and I don't think you should either.

I am

a pilot at an air show

You're in-between a circle and a line, in a certain envelope of mine.

I'm constantly pushing the flight envelope in the air — between the ground, where the earth looks flat like a line, and outer space, where it looks like a circle.