A type of tremolo for eighth notes, like a quivering note, represented by two thick lines drawn through the stem.
Popcorn by Hot Butter
I believe your speaking of the symbol called Luvanmusiq, from Musiq soulchild's album named Luvanmusiq.
Their cat is called Armani :) (Which sounds so cute when you say it with their accent ;D)
b.e.a.t
An unknown number represented by a letter or symbol is a variable.
A long vowel sound is marked by a bar across the top, called a macron.
An element's one or two lettered representation is called its chemical symbol. For example, hydrogen is represented by the symbol H and oxygen is represented by the symbol O.
The symbol is called an asterisk, which is represented by the symbol "*". By adding the letters "ast" to "aster", you get the word "asteroid".
Phonology is the study of speech sounds in a particular language. The vowel sound in the word herd is represented by the phonetic symbol called a schwa.
the sh was represented by a horizontal rectangle, called a "garden pool" 
Is called a variable and is represented by and letter
Be is the chemical symbol for Beryllium.
Aries' symbol is the ram.
The symbol for density is represented by the Greek letter rho (ρ).
The symbol used on Passover is called maror (מרור) in Hebrew, which is usually represented by horseradish or lettuce.
The currency used in China is called the Chinese Yuan, and it is represented by the symbol ¥.