He aha ka peni highlighter?

ʻO kahi mea hoʻohiwahiwa, i kapa ʻia hoʻi he peni fluorescent, he ʻano mea kākau i hoʻohana ʻia e hoʻohuli i ka nānā ʻana i nā ʻāpana o ke kikokikona ma ke kaha ʻana iā lākou me kahi kala ʻālohilohi a translucent.