てっぺん鉄片teppen
1.
Small fragments or pieces of iron that have been broken off from a larger object.
2.
Shards of iron resulting from the process of breaking or cutting, often of varying sizes.
3.
Remnants of iron material that can be found as discarded or leftover bits after fabrication or destruction.
Example:
線路の上に鉄片があったために列車は脱線した。