A navigational device which measures the angular separation of stars with reference to a known time and place in order to achieve precise navigation.

plural of tracker mortgage

(UK, finance) A variable-rate mortgage where the amount of interest paid on the loan is linked to the Bank of England's base rate by a fixed differential.

Device that moves so as to aim a collector of solar energy at the sun as it crosses the sky

(slang, LGBT, sometimes derogatory) A size queen.

A wearable electronic device, or a software application, that monitors and tracks fitness-related metrics such as distance walked, calorie consumption, or heartbeat.