LTR or ltr may refer to: == Science and technology == Litre (incorrectly abbreviated ltr), a metric unit of volume Load task register, a computing instruction Logic Trunked Radio, a computer-controlled radio system Long terminal repeat, a DNA sequence found in retroviruses and retrotransposons == Other uses == Left to right, a group of writing systems Letter (paper size) Model 700P Light Tactical Rifle, a rifle manufactured by Remington Arms London Turkish Radio Long-term relationship == See also == "Left to Right", a short story by Isaac Asimov...