LTR

LTR or ltr may refer to:

Science and technology

• Learning to Rank, an algorithm used in the construction of ranking models for information retrieval systems
• Litre (or liter), 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
• Left-to-right mark, a typesetting control character.