The term 'Siren Sound' refers to the loud, high-pitched noise made by a siren. This sound is typically used to alert people of an emergency or to signal the start or end of a period of time. The crossword solutions for this term are WAIL (4 letters), BLAST (5 letters), and BLARE (5 letters). All three words describe the loud, piercing sound made by a siren. WAIL is a verb meaning to make a long, high-pitched, mournful cry or sound. BLAST is a verb meaning to make a loud, sudden, explosive noise. BLARE is a verb meaning to make a loud, harsh sound.