缿
xiàng​tǒng

whistle-blowing tube

Senses

缿筩 xiàng​tǒng whistle-blowing tube

(literary) a vessel used in ancient times for receiving anonymous reports or secret information; shaped like a bamboo tube, it allowed documents to be inserted but not removed

References

variant 缿筩/缿筩 銗筩/銗筩
variant 銗筩/銗筩 缿筩/缿筩