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_86 (border VARCHAR, background_colour VARCHAR, shape VARCHAR)
### Question:
Which sign had a yellow background and a triangular shape?
### Answer:
SELECT border FROM table_name_86 WHERE background_colour = "yellow" AND shape = "triangular"