Pronounced xiao (falling tone) — Qieyun (Qieyun), using "hu" and "niao" for fanqie. Pronounced xiao (falling tone) — Jiyun (Jiyun), using "xin" and "niao" for fanqie. "Shuowen Jiezi" explains it as: the patterns on iron tools. Also, pronounced jiao (falling tone) — Guangyun (Guangyun), using "gu" and "liao" for fanqie. Also, pronounced tiao (falling tone) — Jiyun (Jiyun), using "ta" and "diao" for fanqie. The meaning is the same.