便条 (biàntiáo) is a noun meaning "a note" or "a short written message." It refers to informal, brief written communications, often handwritten. Common collocations include 写便条 (to write a note) and 留便条 (to leave a note).
我在你桌上留了一张便条,记得看一下。
Wǒ zài nǐ zhuō shàng liú le yì zhāng biàntiáo, jìde kàn yíxià.
I left a note on your desk — remember to check it.
她随手写了一张便条提醒自己下午开会。
Tā suíshǒu xiě le yī zhāng biàntiáo tíxǐng zìjǐ xiàwǔ kāihuì.
She casually wrote a note to remind herself about the afternoon meeting.
妈妈出门前总喜欢给我写便条。
Māma chūmén qián zǒng xǐhuān gěi wǒ xiě biàntiáo.
Mom always likes to write me a note before going out.
我在你桌上留了一张便条,记得看一下。
Wǒ zài nǐ zhuō shàng liú le yì zhāng biàntiáo, jìde kàn yíxià.
I left a note on your desk — remember to check it.
她随手写了一张便条提醒自己下午开会。
Tā suíshǒu xiě le yì zhāng biàntiáo tíxǐng zìjǐ xiàwǔ kāihuì.
She jotted down a note to remind herself about the afternoon meeting.
妈妈出门前总喜欢给我写便条。
Māma chūmén qián zǒng xǐhuān gěi wǒ xiě biàntiáo.
Mom always likes to write me notes before she goes out.