Is there any symbol to represent a vowel? Is there any symbol to represent a constant?
For example "bog", "bat" and "bag" can be represented by
Udate: In a paper I want to describe how pronunciation of words are changed in Persian according to word that are before or after them. It depends on the initial letter of adjacent words, that is a vowel or a constant. I want to show some patterns, using a symbol for vowel and another one for constant. They will act like variables in mathematics.