a round peg in a square hole
a square - hole obstacle
a square peg in a round hole
brass screw with square head
coaxial line with square outer conductor and circular inner
coaxial with square cavity
concrete with square steel tubes
cotton-polyester burnt out with square insertion
cutwork traycloth with square insertion
galvanized square washer
hand-rolled silk square with scalloped corners
headless screw with square
improved square-hole type
iron screw with square head
iron-bearing phase with square shape
lag screw with square head
least square round method
least square with constraints