"operator" - key terms from Wikipedia

airport operator
assignment operator
boom operator
bounded operator
camera operator
conditional operator
difference operator
differential operator
dipole operator
eod operator
former operator
gsm operator
human operator
integral operator
ladder operator
laplace operator
laplacian operator
largest operator
linear operator
lowering operator
mobile operator
modal operator
network operator
npg operator
operator
operator	and loader
operator	checks if
operator	interface
operator	mutants
operator	network
operator	overloading
operator	precedence
operator	site
operator	status
radar operator
radio operator
ranger operator	series
relay operator
reminiscences of a stock operator
selection operator
sobel operator
special operator
standard query operator
system operator
telephone operator
ternary operator
tone mapping operator
tour operator
unitary operator
wireless operator