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marker

marker /ˈmɑɚkɚ/ noun
plural markers
marker
/ˈmɑɚkɚ/
noun
plural markers
Britannica Dictionary definition of MARKER
[count]
: something (such as a sign or an object) that shows the location of something
: something that shows the presence or existence of something
: a type of pen that makes wide lines see picture at office; see also magic marker