Few terms I came across recently:
DINK - Dual Income, No Kids
DISK - Dual Income, Single Kid
SISK - Single Income, Single Kid
SINK - Single Income, No Kids
SITK - Single Income, Two Kids
SIPK - Single Income, Parents + Kids
HIFI - High Income, Financially Independent
DINKY - Dual Income, No Kids Yet
HENRY - High Earner, Not Rich Yet
DINKWAP - Dual Income, No Kids, With a Pet
What else?