Asian lady beetle; harlequin ladybird; Halloween beetle
Refers specifically to Harmonia axyridis, a common ladybug species with highly variable spot patterns. Often called テントウムシ in everyday language, but ナミテントウ is the precise species name.
See also: てんとう虫
The Asian lady beetle is a beneficial insect that eats aphids.
This harlequin ladybird has red spots on a black background.