Ladies' Fashion

The Casio "LTF" prefix designates a Ladies' Fashion Timepiece.
Here is the quick breakdown of what the letters mean:
L (Ladies): Sized for women's wrists.
T (Timepiece): Standard analog quartz watch.
F (Fashion): Features non-traditional shapes (like square or rectangular cases) or unique style elements.
In short, it is Casio's line of stylish, geometric dress watches for women.