Meanings

triangular matrix

upper triangular matrix

equal contest

anomaly

square pipe

angular displacement

orbital inclination

elongation

declination

cornucopia

baseball played without a second base (children's game)

Spring Triangle (asterism)

Winter Triangle (asterism)

Summer Triangle (asterism)

angle of friction

octagonal mirror

harsh words make the going rough

hex key

double-height size (of text)

double-size character