[bendykstra]

Tesla is a unit of magnetic field strength. Hertz is a unit of frequency. Siemens is a measure of electric conductance. Try to find an SI unit that isn't also a company or product.

Trademarks aren't about owning a word, only about having exclusive use of it within a certain domain. If Instagram is successful, you will still be allowed to use the SI unit to quantify mass. You won't be able to market a competing product or service with the same name.

[genbit]

> a certain domain do you know if this domain is as broad as "app" or "photo app?"

Example If I make a product called GoldGram, that will display trend prices for gold gram - it will be violating trademark?

[groby_b]

See also: "50 Shades of Gray" :)