Nabla Side by Side Eyeshadow Palette, Ruby Lights Glitter Quad, Major Pleasure Mascara and Ruby Brush Set | See the World in PINK
![Fermat's Library on Twitter: "The nabla symbol, commonly used in math to represent the gradient of a function ∇f, is so-called because it looks like a harp and the Greek word for Fermat's Library on Twitter: "The nabla symbol, commonly used in math to represent the gradient of a function ∇f, is so-called because it looks like a harp and the Greek word for](https://pbs.twimg.com/media/DgN6zOPVAAAcoAg.jpg:large)
Fermat's Library on Twitter: "The nabla symbol, commonly used in math to represent the gradient of a function ∇f, is so-called because it looks like a harp and the Greek word for
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