线 (pinyin: xiàn, written "xian" or "xian") means line, thread, wire; clue, trail. Below: its meaning, pronunciation, stroke order, and example sentences, so you can learn how to read, say, and write 线.
Meaning
line, thread, wire; clue, trail
Stroke order
线
Examples
这条线路全长一千八百公里,最高时速三百五十公里。
zhè tiáo xiàn lù quán cháng yì qiān bā bǎi gōng lǐ, zuì gāo shí sù sān bǎi wǔ shí gōng lǐ.
The line is 1,800 kilometers in total length, with a top speed of 350 km/h.