重码

重码	chóng mǎ	repeated code / coincident code (i.e. two characters or words having the same encoding)
重	chóng	to repeat / repetition / again / re- / classifier: layer
重	zhòng	heavy / serious / to attach importance to
码	mǎ	weight / number / code / to pile / to stack / classifier for length or distance (yard), happenings etc