CREATE TABLE table_57200 ("Type of sign" TEXT, "Shape" TEXT, "Border" TEXT, "Background colour" TEXT, "Text/Symbol" TEXT)

Which sign has a red border and a warning sign?
SELECT "Text/Symbol" FROM table_57200 WHERE "Border" = 'red' AND "Type of sign" = 'warning'
SELECT "Text/Symbol" FROM "table_57200" WHERE "Border" = 'red' AND "Type of sign" = 'warning'