Final answer:
"TI" in TI-8x line of graphic calculators stands for Texas Instruments.
Step-by-step explanation:
The acronym "TI" in TI-8x line of graphic calculators stands for Texas Instruments. Texas Instruments is a multinational technology company that designs and manufactures a wide range of electronics, including calculators. They are known for their popular line of graphing calculators used by students in various math and science courses.