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bead

bead /ˈbiːd/ noun
plural beads
bead
/ˈbiːd/
noun
plural beads
Britannica Dictionary definition of BEAD
[count]
: a small, usually round piece of glass, wood, stone, etc., that has a hole through its center and that is put on a string with other similar pieces and worn as jewelry or that is sewn onto clothing
see color picture on this page
: a small, round drop of liquid (such as water or blood)

draw a bead on

also US get a bead on or take a bead on
: to aim at (someone or something)
often used figuratively