熒光筆 [荧－笔]

Jyutping jing4 gwong1 bat1
Pinyin yíng guāng bǐ

Definitions (CC-CEDICT)
  1. highlighter (pen)
Definitions (Wiktionary)
  1. noun, Hong-Kong, Mainland-China
    highlighter
    (syn.) 螢光筆, 萤光笔