极坐标

polar coordinates (math.)

extremely / pole (geography, physics) / utmost / top

to sit / to take a seat / to take (a bus, airplane etc) / to bear fruit / variant of 座[zuo4]

coordinate (geometry)

mark / sign / label / to mark with a symbol, label, lettering etc / to bear (a brand name, registration number etc) / prize / award / bid / target / quota / (old) the topmost branches of a tree / visible symptom / classifier for military units

system of polar coordinates