Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_18 (phoneme VARCHAR, letter_name VARCHAR)
### Question:
What is the Phoneme symbol for the letter name zɛn?
### Answer:
SELECT phoneme FROM table_name_18 WHERE letter_name = "zɛn"