Ice blades that are a signature weapon of [[Yanqing_(honkai:_star_rail)|]]. He can summon several of them at a time.

This refers to the specific weapon(s), even if they are not currently flying (e.g. on the ground). Likewise, do not use this tag for any other sword in Yanqing's possession -- indeed, Yanqing usually wields in hand (or [[sword surfing|surfs on]]) a more metallic sword, not a Flying Sword.
flying sword (honkai: star rail)