You are >! e I'm a letter. >! E is a letter I am found in an elephant >! E is in the word elephant and oh! I am heard too, by a person sense of hearing! >! **e**ar Sometimes, I am also used in a cartesian plane, or maybe used as a word to describe things are growing really.. really fast.. unless I am negative :/. >! Euler's number is used to approximate limits I am a letter, but found commonly in letters! >! E is the most commonly used letter in the English language And I am also sometimes commonly known as a latter (In English). >! ?? Beat that! I'm in between the lines of music that have a very troublesome chef.... just below the highest "seen" staff. >! In bass clef, the note "e" is inside the staff. Look at that buns I just made! (I know it's bad) >! ?? I'm used in banks after I was discovered by approaching to a limit. I mean, I was discovered to have numeric use. >! ?? A child uses me when in digust (sometimes). >! **e**w? Oh... I'm so rational... NOT. >! e, as in euler's number, is irrational