note / memo

 note   
 a short piece of writing to help you remember something

memo
 an official note from one person to another in the same organization

http://www.oxfordlearnersdictionaries.com/us/definition/english/note_1?q=note

http://www.oxfordlearnersdictionaries.com/us/definition/english/memo?q=memo


https://www.google.com.tw/search?hl=zh-TW&biw=1307&bih=678&site=imghp&tbm=isch&sa=1&q=note&oq=note&gs_l=img.3..0l10.155244.157159.0.157902.7.7.0.0.0.0.151.606.5j2.7.0....0...1c.1.64.img..0.7.604.R-lmgjHAZc8


https://www.google.com.tw/search?hl=zh-TW&biw=1307&bih=678&site=imghp&tbm=isch&sa=1&q=memo&oq=memo&gs_l=img.3..0l10.163519.167725.0.168336.7.7.0.0.0.0.49.275.7.7.0....0...1c.1.64.img..0.7.274.m69PQNpqIEo