0 Old HSK word(s):
信号弹* *

Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

信 trust, believe / letter
号 mark, sign / symbol / number
弹 pellet, bullet, shot, shell

Hsk Characters:
HSK -Characters and beyond:
GbBig5EngRadMegaTripleMultilingual